Decent move for him, given the U23s being relegated.
Hopefully he will be one of those players that makes 50-100 appearances in League One, then a similar amount in the Championship, then becomes a solid PL player in his mid to late 20s. However, it is striking that, not for the first time, a player highly regarded on here, ends up moving to a League One team; that rather implies that a lot of Championship managers didn't want to take the risk at this stage, or weren't that impressed. So the idea that he is currently better than Italian international Darmian, seems unlikely to me.
Joe's Sheff United loan consisted of being an unused sub for 3 matches, 1 min as a sub, his one start, back to being an unused sub for a game, then injured. For United, one start in the Europa League and one sub appearance in the FA Cup, an unused sub for 4 matches, all between mid Feb and mid March, in LVG's 2nd season, during an injury crisis.
I tend towards the view that first team training probably tells you a lot more about how ready young players are, than games at U23 level.