OK, I just checked the DVD. Here's the evidence:
There's no saga cell at all, not even Scott's Season 1 version. We just get Scott's "Here's what happened last time" setup, then the leap into the episode. The first part of Act I has been turned into the teaser, as happened to all Quantum Leap episodes upon rerun.
The only time this setup was used was during the first part of the second season. By the second half of the second season, Deborah/Ziggy's saga sell was dubbed onto all episodes, even first-season reruns.
But that means a rerun of Seymour had to air either before the first broadcast of What Price Gloria? (on Oct. 25) or after a rerun of Camikazi Kid (which aired in December -- I have a VHS copy which has him leaping out from "Portrait for Troian" into a rerun of "Kid").
My VHS copy of Seymour comes from the summer of 1990, when it was rerun with the new saga sell and opening credits. Sam then leaped into the rabbi from "Thou Shalt Not..."
While it's not impossible that NBC re-ran Seymour more than once, it seems highly unlikely to me.
What I'm saying in a roundabout way is...I dunno.
I threw out the facts and theories that I could think of, but as far as hard info, I can't crack this case at all.