As you have probably heard, there seems to be a schism in the Vikings' locker room. And you know how much that matters at the moment? Not at all.
QB#4 is the starting quarterback. Are there some hard feelings about the way he joined the team? Most likely. Does most of the locker room want either Sage Rosenfels or the Tarvaris Revolution to be the starting quarterback right now? Probably.
But, as Matt Bowen at the National Football Post points out, that's what happens when special circumstances happen. And there will likely be some hard feelings about those special circumstances, but as the great football mind Brad Childress (heh) said, "Business is business". And football is a business. If the Vikings, and QB#4 are successful, none of this is going to matter. Honestly, if QB#4 comes out and plays well against the Texans, the controversy probably goes away--having a long track record of success tends to get you the benefit of the doubt that preseason success will lead to regular season success.
And even if he doesn't play all that well, he has some built in excuses that'll buy time until the regular season (you know, the whole "less than two weeks of practice time" excuse that he created for himself). Of course, if the Vikings and / or QB#4 stumble in the first four games of the regular season, well, then things could get ugly. Special treatment isn't a big deal if the team is successful, but if it isn't, it can lead to a whole lot of problems, many of which can lead to even more problems. But there's no chance of that ever happening, right?