They never said anything as negatively as I put it, but the picture I got was that Alex and Maia "found themselves", which is a good thing, but by "finding themselves" they had to really put Marina in position where she had less say creatively. Honestly, if Marina was able to make programs that were winning them gold medals, they would have been less likely inclined to rock the boat, as most people would be. Remember, once Igor left, the Shibs went from World bronze medalists in their debut senior season to almost missing the third Olympic spot in Sochi and then stagnating and being frustrated. They talked about their frustrations and having downs a lot before they "found themselves".
They relied on her for her coaching and her team and her eyes (and maybe politick). Of course, they don't say that and they are very positive towards her (as almost all Marina students are...I've notice there's this maternal dynamic going on), it's just based on me being a super fan since they were juniors and watching their career unfold since then and just how off-the-beaten-path it's been. A lot of Shibs fans during the Olympic year worried that Maia and Alex were relying too much on themselves and didn't have someone like Carol Lane or Marie-France who had a strong sense of dance to really re-work their dances, but Maia and Alex were able to revamp their second Coldplay FD before the team event in Pyongchang.
Here's an article I found where they discuss making their programs and what led to it and how they had a rough ride:
If you Google "Shibutani" and "taking ownership", you'll see a bunch of results about taking control over the creative process.