You do know Gibbs massively bruised that foot a week before, and had a suspected break of the bone thats now broken, I guess you do know that right. So I think its fairly safe to say, the foot was weakened, which didn't help in the challenge. There was no need to risk him, he very much almost broke that same bone a week ago, you have the Chelsea game coming up which also offers him 3 more days to rest/heal the foot.
I don't think its a huge leap to suggest that bad tackle + weakened foot = break, plenty of bad tackles go on without breaking anything.
But this is the point, we played a WOEFUL team, Clichy is already hurt, Gibbs is young and played in the under 21's, even if he hadn't hurt himself against the under 21's, he's going to be playing a lot of games, or would have, before Clichy's back from injury, I would have been protecting him anyway and wouldn't have been playing him against a truly awful team, at home, in an unimportant game even if he hadn't almost broken his foot a week ago.
The second Clichy got injured Gibbs became our first choice left back, when someones just sustained a suspected injury, you'd never rush them back for a game you'd often not play first choice players in anyway. he's a kid, whose never played lots of competitive games consistantly, he was expected to play a lot over a very short space of time due to CLichys injury, I wouldn't be playing him against Liege, or Wolves, or any other bottom 8 team right now. We did, he's injured, bad tackles happen, every game risks people being injured from bad tackles, theres no crystal ball to know that. The fact he had a weakened foot meant it was a serious risk that he could hurt it, from running, let alone from a bad tackle, it was an immensely stupid risk to take with a HUGE game 5 days later.
AS for Barca, we have no idea if they'll top their group, before tonight they'd look distinctly average in both league and Europe. If anything I'd want to face them as early as possible before Ibra clicks with the team and the team clicks with Ibra better. Barca can have a bad game like anyone else, I don't know how you can go into a cup and try and win it, but convince yourself theres one team that you can't beat.