I remember commenting on JWP adding a nastiness to his game, or smartly using the "dark arts", as now known which had never been seen before in the past year, which was adding to his overall contribution to the team. Most noticeably against Zaha to get under his skin and scuffing the penalty spot for England. But, this has been missing in recent months, for whatever reason.
Diallo looked good in his introductory outings, but it's clear that he needs to be drip fed into the team like Salisu, rather than getting pushed straight into the deep end due to injuries. Been quite poor, anonymous and getting the basics wrong in recent matches, which you do not want in the centre.
Unfortunately, there isn't an alternative for now. Jankewitz isn't going to be put back in.