I dont believe it would be an improvement at all.
I don't see any redeeming qualities in Hughton that suggest he's ready to manage this team to anything but abject failure and humiliation, so I'll assume you're just making a comparison between Kinnear and O'Leary.
For me, Kinnears health is always going to be a problem but more than that I don't think he's that good of a manager. O'Leary had a lot to spend at Leeds, fine, but not so much at Aston Villa, and I think did well enough for both clubs considering.
Not my first choice by any stretch but in what ways do you feel Kinnear, or, God help me, Hughton is a better manager?
Isn't he saying O'Leary would be better?