X and XX happened as stopgap solutions because there was no way MH5 would be ready by 2015 and this is prety obvious since X´s purpose was to be an allstar game, some kind of best of the franchise with minimal financial involvement.Pretty much.
Tri = MHW
Portable 3rd = upcoming Switch title
Why would we as the public hear of such internal rift ? There is no way that everyone was immediately on board when they decided to skip portables with the next main title without some kind of plan B. For all we know X, XX and X HD and the Xbox One MHW version happened because there were people that didnt wanna put all eggs in one basket.
It's also prety obvious MHW was running behind on schedule and led to the release of XX (and that angered the fans).
As for internal rifts, you would expect shakeups within the company, there were none to speak of