To be fair, there is only a single post on Reddit from what I can see saying about an 'uneasy atmosphere' in the arena, and that's someone's perception of it. Looking at things on social media, those who went are generally having a good time. But I do agree it's definitely giving too many changes all at once. I guess they couldn't help some things beyond their control like injuries and voluntary choices not to come back (in one case, if tea on Reddit is to be believed). They should've tinkered with the team last series to make things a bit easier this time around with more changes if wanted/needed to make any. I feel one of the biggest problems with the show is the lack of change...literally everything has been the same for three seasons, except new games and two new Gladiators.
I do think it's unfair what's happened to Craig, the chap who has been 'blacklisted' by Hungry Bear/BBC. They've only singled him out because they know him and know he has an Instagram site about the show so they to keep as much control as possible. They're not going after the numerous others who are giving out spoilers from the arena on Facebook and Reddit for breaching 'policy'. It does seem like he's taking the rough with the smooth and taking some positives of the situation, which I feel is the right thing to do.