My sense is that San Antonio's strategy is to tank this season and get another high-lottery pick to pair with him, hoping to land another high-ceiling star. They can use cap space and put together a contender pretty quickly from there. The rest of the league just has to hope that they end up picking like 6th or 7th, and don't get an impact player out of it.
I'm sure Pop knows what bad habits can emerge from Wemby's teammates being shit (he probably saw it with Young Duncan, frankly), and is focusing on that in practice and conversation. I haven't watched every Wemby game, but I've watched a fair amount and really haven't seen him take "whatever, fuck it" 3s, throw the ball away on bad passes, bad decisions on transition, dribbling into traffic, or other stuff we might assume that "my teammates suck, I'll do it all myself" would create. He seems pretty disciplined about trying to make the right play, even if the likes of Sochan largely can't pass or shoot their way out of a wet paper bag.