I do recall being slightly disappointed about Zoro's decision to train under Mihawk before the skip, but I've long since accepted it. Besides, as BDK pointed out, it'll actually make things more interesting if this means that Mihawk will be toppled by a swordsman other than Zoro before they have a proper rematch. It actually reminds me of many moons ago when people were speculating left and right about how epic a Luffy vs. Ace/Whitebeard match would be, but then the events leading up to the war happened, and..... well, you all know the rest.
To go back on topic, I'm getting more curious about what ol' Kinemon's up to. We haven't seen him these last few chapters since he ran off to find his torso, and we STILL have zero clue as to what became of his son. Did CC turn Momonosuke into a giant crackhead like those other kids, or did he convert him into some grotesque beast like that dragon or slime.....?