To Dave Roberts, the roster crunch facing the Dodgers might be a good problem to have. But the situation still presents a problem. The good news for the club: Mookie Betts is set to be activated from the injured list Monday, making his awaited return from an oblique strain that has sidelined him for more than a month. Mookie Betts is set to be activated from the injured list Monday, forcing a “tough decision” with roster. Jayne Kamin-Oncea-Imagn Images What that means, however, is that someone will have to be squeezed off the active roster in a corresponding move. And on the eve of that decision Sunday, no easy answer had yet emerged. “It’s a potential tough conversation,” Roberts acknowledged, saying the club had yet to finalize its choice. “I could make a case for all the guys we’re considering.” The three candidates for the chopping block have been obvious for a while: infielders Alex Freeland, Hyeseong Kim and Santiago Espinal. Each of them, though, still offers value to the club.…