It's OL play and punt returns to me. Nearly every other facet of this team has improved dramatically outside of those two.
OL has improved, but not enough. Pass pro is marginally better, but not good enough to win us games. Run blocking has improved quite a bit, though there's still more work to do. And shout out to Austin Allen who has done a great job blocking after the first game. He had a rough game against Illinois but has really upped his stock IMO.
Punt returns stink. We barely block, we don't go after kicks, and with neither of those happening we aren't making returns. The only good thing is we're catching the ball and not dropping it or losing 10+ yards on the bounce. Other than that we may as well not put a return man back there...