That is most likely part of your problem.
BB turkeys are prone to perosis aka slipped tendon. On poor feed they are even more likely to develop it early due to their fast growth nutrition requirements.
BB poults in particular really need an appropriate high protein turkey or game bird starter that has the higher lysine, methionine and niacin to give them a good start in life. They need this for at least the first 4 to 6 weeks.
You can supplement their niacin and thiamine needs by providing vitamin B complex made at the rate of 1/2 capsule dissolved in one gallon of water. Make it their only source of water. It should be made fresh daily.
The thing I noticed is that those poults are being kept in far too small of a cage. They need much more space than that. The cramped space is the reason the others are walking all over the hurt poult.
If it does have slipped tendons, I would cull it.