Verse isn't as impactful on the Seahawks.
His college teammate was taken in round 2 at DT: Fiske. Fiske had 51 QB pressures,, 8.5 sacks, and 2 FFs, 13.2% pressure rate=5th among int DL. Draft one without the other and you won't get the same results. Additionally, Rams led the league on QB pressure from DL stunts. That's not a stat Verse owns. It's the entire line that had to be re-made without Donald.
It's irrelevant to discuss Verse v Murphy. You have to take Seahawks top 3-4 picks to equal Rams round 1 and 2 (Seahawks didn't pick in round 2). Verse and Fiske were a set, not individual pieces. If the Seahawks had picked up the 2nd or 3rd best Edge rusher in 24 along with Murphy, would that have elevated Murphys stats?
Assuming the OL in Seattle makes a notable improvement, it won't be solely a result of Zabel.