Worth noting, he's got another year on his contract, and even Fissler thinks there's little to nothing in it.
That said, I wouldn't blame him at all for feeling that he doesn't fit with what Silly Bollox wants from a flanker (either side), and takes the money.
If he does go, I think England will suffer more than Bath, weirdly.
What he does is irreplaceable, but Bath have good cover for the position itself, which will take a couple of years to come online at an international level.
I don't think his potential departure has anything to do with signing Pepper - that was pure opportunism. The opportunity was there, so why not take it? Besides, IIRC, we signed Pepper before Sam re-signed (or at least, announced the one before the other)