So is Lord English adult Caliborn? It seems like he would be but I saw something about it not being confirmed. Also what happened with the one Jack who turned Englishy? Gold pegleg, weird eyes and such.

Yes Caliborn is most likely LE, like 99% confirmed. There’s always the chance that Hussie will throw us curveball and someone else will turn out to be Lord English, but it’s unlikely.  And Jack English is still around, he’s just by Prospit and the narrative has been focused more on Derse lately so we haven’t seen him in a while.