Warning: This announcement was very December 25th for me, so I kind of have a lot of thoughts.
As in, a skater past her 18th birthday or a skater 19 or older? Medvedeva already worked with Tutberidze when she was 18 and I know it's become popular to say that Zhenya didn't even deserve to make the podium in Pyongyang, but I am of the belief that if Medvedeva hadn't gotten injured in late 2017, she would have her Olympic gold and this would all be a moot point.
I think it's clear that if these were actually "test" skates in any kind of qualitative sense, then Zhenya failed. Also, unfortunately she is not a skinny young Asian man with effortless Polina Edmunds-esque jumps. She needs a hands-on in-rink approach. This whole remote-coaching was never a tenable idea and should have been nixed months ago. The failed(?) cartwheel appeared to be a symbolic cry for help.
Fans have a lot of differing opinions regarding Eteri and her techniques. I personally believe Tutberidze probably knows Medvedeva better than anyone as Zhenya started working with Eteri around 8 or 9 years of age.
They were also one of the best partnerships in modern skating history. It feels like yesterday when Lipnitskaia's growing body betrayed her at 2015 Skate America and it manifested in resentment towards Medvedeva. It's a situation ripe for irony when Medvedeva was in turn usurped by her own teammate Zagitova in a similar fashion in front of the whole world at the Olympics.
Only, as was mentioned upthread, I definitely think Eteri preferred Zhenya to Alina and maybe even wound up feeling guilty she played such an integral part in her favored student just missing out on something they had been working towards together for 10 years.
Anyway, I am not naive or stupid, and I see all the extenuating circumstances in play, but it is nice to see both women being mature enough to let bygones be bygones for now in pursuit of a bigger goal. Brian has also been nothing but classy, but it's not like he really has a choice if Zhenya could not actually enter Canada

(I keep reading this, but am not sure how true it actually is).
I will admit though, I am very excited about this reunion. The nostalgia alone makes me misty-eyed. I also think if anyone can get Zhenya into the kind of shape she'll need to be to make it onto major teams out of Russia, it's Eteri.
In fact, Eteri could very well be Zhenya's last and final hope. Why not move to Eteri for one last push? It's not the worst idea, because the passing of time stops for no one.
And I say that as one of Zhenya's biggest fans who has loved her since the 2014 Junior Grand Prix Final where she was wearing that brown dress. And even 3 or 4 days ago I was saying if she wants to keep skating, I hope it's because she wants to continue to improve her style and artistry. Cause honey, I'm just not sure the jumps are there anymore.
And I admit I was a bit confused on what the end-goal was. It seemed very unlike Zhenya to just be content with carrying on Fumie Suguri Style. She is fiercely competitive and has won nearly everything in the sport. I don't want to think she is only still skating because of the one thing she didn't win.. because that would be, well.. unrealistic, to put it nicely.
Cause unless a
Drop Dead Gorgeous situation happens where everyone but her gets deathly ill and is unable to compete, I can't see her winning in Beijing. Possibly her greatest career achievement is that she went nearly 2 1/2 years without being beaten (including an undefeated season) which is just incredible to think about. But some things are more about timing than anything else.
She couldn't do it (win the Olympics) when she was 18 and already most-likely past her prime physically.. At 22, it would most likely literally take an act of God. Eteri is good, but she's not that good. I'm
praying 
she has more attainable, reasonable goals in mind. Like maybe making the Olympics and getting to compete fully healthy. That is still a very tough ask with the depth in Russia, but it's not a goal where she would be doomed to failure.
I get the impression that the less Alina has to think about, the happier she is. Also, I imagine she is very busy in her studies to become the next Diane Sawyer.
So did I!

It was mostly an excuse to practice my beyond-basic Russian. I wrote: "Спасибо Этери и Женя

"
And I mean it! They have truly given me my life today!
Your concern over people I don't think you even know personally is... well, a plethora of adjectives come to mind, but the one I'm going to start with is
alarming. Because your post was a bit unsettled. However, it is certainly worthy of a few more descriptors:
fantastical,
offensive (for the multiple people you speak about as though you know that you
don't know),
ridiculous,
senseless,
confusing,
pointless, etc. But I will thank you for the entertainment, because a boy do like to be entertained

.
I think it's safe to say Doug Haw won't be on TSL anytime soon.