Holland needs consistency - he had some good games but also a lot of totally ineffective ones. At 23 he’s on the verge of no longer being a ‘young’ player who can keep being referred to as having potential. Next season has to be the one where he pushes on.
The main worry is those hamstrings. They’re a chronic issue and he barely played any football last season, even at academy level. He left here nearly 18 months ago and has made one appearance in the pizza pot, and maybe half a dozen in the U23s in that time. He’s older but not really any more experienced.
Good luck to him if he comes back, but probably worth tempering expectations if he does. He will need time.