I've made a thread in the past that I though Spencer has been everything we expected in run D and pass coverage but just hasn't turned the corner yet as a pass rusher.
In addition to that, watching game tapes of Ellis rushing the passer last year, it was clear he didn't have the elite speed needed to run by RTs, but his bull rush was still way better than Ware's -the old man has a sick bull rush and a game like the 2nd Commander game comes to mind where he just about pushed the RT back into Campbell on nearly every passing play. He was noticeably a better pass rusher than Spencer, which is why I thought he'll no doubt be on the team this year.
Add these together, with Wade's defensive philosophy, knowing he'd be one to sacrifice run D before he did pass rush, and it's clear that Spencer must have been showing a lot in terms of rushing the passer. We could argue that the rookies will also be a factor, but I doubt we'll be going into the season relying on rookies for that role.
I've only had doubts about Spencer's pass rushing skills. But now, it looks like the coaches share none of those doubts.