It’s not a good theory at all. Never been done before and won’t happen now. Zero chance, iow.
I’ve got a better theory, not necessarily a good theory, but one that makes the most sense based upon what we’ve been seeing and hearing.
Namely, Rams have already made the decision to move on from Goff and they’re either putting the finishing touches on a trade mostly in place and/or have decided which draft pick they like the most.
Going with any QB currently on their roster seems very unlikely for next year. Snead dislikes gaping holes going into the draft, much less the season.