If you look at the position 'rooms' and what has happened so far just based on the portal ins and out, not overall talent lost from graduation:
QB - Manske is the key here. He appears better than the back ups we had behind Grunk so call it a wash
RB - very unproven group though Martin did well in the bowl game and got the ISU starter and OSU kid - Wash at minimum, potential upgrade
WR - Howard stayed and the rest of a bad group left. All the ISU kids are bigger and another potential guy joining today. Probable big upgrade.
TE - 2 in, 3 out, does Olesh develop is the only thing that may sway this and change the grade but generally a plus for next year but minus long term potentially
OL - They kept a couple of the main guys, got a couple young OT and two huge OG. Still need a starter level OT couple more OL for depth but very few of our 4/5 star OL recuits have panned out recently. Another wash with a TBD to see how the new OL coach develops.
Overall I'd give the offense an upgrade just due to the WR group. Securing a legit starting LOT would make it a big +
DT - UCLA kid cancels out Gilliam, OSU kid cancels out Wafle, ISU kid cancels out Artis, at least 1 more soon to be added. Wasn't any studs in teh group to begin with so this is an upgrade.
DE - Colorado kid and Harvey cancel out but still need to pick up 2-3 more in this position. Kept some good ones of the roster but portal wise a loss so far.
LB - Losing Campbell hurts but Bacon is rated higher. Picked up two other LB who are bigger than Speca/Wylie. Probably need one more, but the trade bacon for Campbell is a win.
CB - Big minus so far. Hunter Sowell may be a CB but hes listed as safety. He's on the small side but either way he's the only one we've picked up. Definitely need a couple more.
S - the 2 ISU kids are at least as good as Lane and Mack, if not better. A little bigger and know the system. Slight upgrade.
Defense is a downgrade so far as DE/CB are a lot worse but LB/DT/S are better. Getting the right couple guys to fill out the DE/CB rooms would change the grade here.