It is the simplest and probably best decision to make:
1) Doubt there are calls from the players for maguire to be stripped so its not going to affect squad morale keeping him as captain
2) Keeps the pressure on him to perform this season, if he doesn't then he should be sold
3) Bruno had just as bad a season as Harry (maybe not as bad but a bad season) so should not be rewarded with the captaincy
4) Ronaldo...just no
There is no real pressure to strip him just yet, if he plays bad he will be dropped hopefully if we have martinez, varane etc. Sometimes the best decisions are the decisions not made, far more important things to sort out.