Ince got on superbly with all the players you mentioned as well as Giggs and Sharpe. Ince was not a disruptive figure in terms of likeability, but his presence was said to be somewhat overbearing in the sense of leaving an impression on others, and certainly the more impressionable or unmoulded - which is a prime concern when talking about youngsters who don't know themselves yet and are still there to be turned by influence. Ince having that overbearing presence, and kids being impressionable was the prime concern. Olders could take Ince for what he was and laugh it off or get along with it and all were of the same mindset when it came down to gameday where Ince's power of influence and personality were always huge factors in our games.
Keane's said many, many times over the years how much he got on with Ince and whilst not gushing stated in no uncertain terms Ince was the right sort because he would always back his words and give 100% come gameday. That side, and those players were all the fiercest of competitors and it's one of the reasons they are so highly regarded alongside the swashbuckling football - their camaraderie might even be said to be the strongest of all out great sides in the Fergie era, so friction amongst the players is not the issue or cause for concern, but the overspill from force of personality and malleability is. Keane would play down his own ability, Cantona would use his presence solely to lead and guide and Schmeichel was intense, but focused - Ince is the one from the four who would let others know he was the dog's bollocks and a force to be reckoned with and if you don't really 'get' people like that, it's easy to perceive them as arrogant, conceited bell-ends. Turns out Ince acted that way as a form of positive reinforcement probably because he was insecure and from a background where you chest thump and overproject to others.
What we don't know is if Ince could have been manipulated by Fergie and harnessed for the benefit of the new generation. It feels like a great shame it ended as abruptly as it did, for one so dedicated to the cause as Ince was.
Personality management wasn't much of a thing for the younger, more authoritarian Fergie, who rarely made exception for any who were short of mercurial, but I bet the older, more measured version would have extracted every ounce of Ince's best years and probably turned him into a different person along the way; not seeing him so negatively and probably trying to understand the person more.
Re. Carrick. Ince was a leader and a person that elevated those around him. Any team he was in, he was at the forefront of (just don't ask him to take crucial penalties) and was there to be shot at as he never hid and was never afraid of the opposition or making mistakes. There's just not much crossover between he and Carrick for them to be compared by, as you've alluded to in terms of roles. In fact, Ince goes alongside Carrick to form a consummate base of midfield, even more, Carrick enables Ince to go, and stay high, for longer without Ince getting told off for overeagerness to attack. Ince would be Carrick's captain and force him as much out of his shell as humanly possible. As individuals suited to their roles, are you going to see more DLP's ahead of Carrick or more CM's ahead of Ince in their respective eras?
Trophies doesn't have relevance, partly for what
@Red Indian Chief Torn Rubber said and also Ince's prime and the team/club maturation phase being taken from him. Ince-Keane in Europe is just a formidable pairing, and one that may have altered the timeline by inserting United into chief players for the CL's that Ajax, Dortmund and Juve got to contest for.
-----------------------Cantona
--------------Scholes
Giggs-------------------------------Beckham
----------------Ince------Keane
Is a wholly different proposition to what we went out with and I wouldn't bet against them against any of those sides of that era. Even in defeat, it'd be some games for the ages.