Sui/Han have demonstrated clearly, an observation that I feel is increasingly true regarding career longevity, comebacks, etc. - and it is that the whole notion of missing a season or part of a season, is not necessarily a handicap. One can achieve the top results, during the most important events, by delivering in the moment. One could argue, James/Cipres demonstrated the other side of the coin. Yes, I understand the idiosyncratic backdrop (the collision during warm up) which was a factor, but along with 'momentum' can come the pressure of 'expectations' for which it takes a rare breed of athlete to consistently bear.
Yes, momentum can be a valuable "thing" and, perhaps more so in dance than in other disciplines, it can work in a skaters' favor. But at the same time, once a team is firmly established as being amongst the best, the key becomes delivering the kind of performance that can win on the day.
In my opinion, a healthy Sui/Han are an arguably unbeatable force in the current field. I would much rather they take as much time as they need, to (ideally) achieve optimal health, in order to shine when it will matter most for them. The Olympics in their home country come 2022.
Eh, in sports, nothing is certain, nothing is written in stone. On paper, everything can look different than final results. That's why we watch. Momentum doesn't mean anything when butterflies start dancing in athletes' stomachs.

Sui/Han do have the je ne sais quoi factor, of course. They are going to be the ones to beat moving forward, but I wouldn't say it's because they aren't at a disadvantage should they continue to strategically or out of necessity take off the early part of the season. Making up that actual or perceived disadvantage is something that simply depends upon the skaters and other elusive factors. Obviously Sui's health will be a factor going forward, so I can understand if her coaches and Chinese fed choose to limit wear and tear on her ankles.
I seriously would not dismiss James/Cipres' worthy accomplishments over the course of their career, and especially over the past three seasons! Winning everything in sight this past season except for the big one at Worlds, is certainly nothing to sneeze at. At 2019 Worlds, the judges seemed intent IMHO on placing a possible win somewhat out of reach for J/C before they even took the ice for their sp.
I say that because of the extremely high sp score given to Sui/Han, a team coming back from injury and a less than stellar showing at 4CCs, their first competition of the season. And especially the very high sp score for T/M, a team who had seemed to be low on confidence and clean programs the entire season. Neither S/H nor T/M, skating before J/C, did anything particularly exceptional in their sps to pull down such overly high marks, all things considered. Yes, both S/H and T/M have stellar credentials and wield deserved rep with judges, but such high scores were indeed putting the possibility of winning a tad out of reach for the top team coming in, whose season's best sp score was 76+ with a one-point time deduction.
At Worlds, S/H received 79+ for an okay sp performance (not one of their best either), that was a bit tight on the jumps, albeit clean. T/M skated better with a new sp than they had all season, after poor music selection had hounded them with their previous sp. Still, T/M didn't do anything spectacularly outstanding that warranted receiving 81+ for their effort. Additional pressure was indeed on J/C after those two teams landed such high sp scores (the only two teams with the talent and judging rep to rival J/C at the top on a level playing field). In the fp, Sui/Han were exceptional and absolutely willed themselves to win, no doubt about it.

T/M were more conservative and cautious in the fp, but the judges had given them a nice cushion so they didn't have to worry as much about the rest of the field, only S/H.
As far as the collision during sp warm-up between Vanessa and Matteo, it is what it was, and thankfully no serious injuries resulted. Certainly, it wasn't helpful to J/C for managing what was already high pressure and high stakes. But it was all a great learning experience. If indeed they were aware of the high scores given to their top rivals, it might have been a good thing if J/C had been able to simply shake it off, laugh a little, and try to just go out and have fun like it was practice. That's of course, way easier said than done. Still, the unsettling warm-up experience coupled with the pressure of being top favorites as well as underdogs, is under their belt. They will hopefully take it all in stride and come back stronger. I'm certainly glad J/C will be coming back to battle next season.
James/Cipres should be given more credit, and more due respect for their stellar talent, and for being the exciting team that many teams have been trying to emulate the past few years.