I don't see how the Saints could afford him, even if they offered him the $1.50 hot dog special at Costco. They just don't have the cap room to re-sign him.
If I'm Houston, I'd be talking to Winston in the event they end up trading Watson.
He has a no trade clause. It's up to him if he decides to accept a trade to a club he doesn't favor. The alternative is, he could sit out until the issue is resolved to his liking.