He missed a lot of the season (most of April and two whole months in June and July). Blue Jays from June onwards were one of the hottest teams in baseball, so they were able to cover up his injury over the course of a 162 game season.
Over a full season, I would expect some regression offensively with him given the low .OBP and over the course of 500 AB's, there is more of a chance to be in a prolonged slump than over 250. Also, last time he put up a 4+ WAR season was back in 2022. Will acknowledge that if Varsho is healthy and clicking on all cylinders, he can definitely get back to being a 4+ WAR player and can be a "main piece" on both sides of the ball. More upside than Gimenez IMO.
As for Gimenez, like you said earlier, I think he's the Jays starting SS next season and moving forward. That was likely the plan from day one when the Jays acquired him. Atkins and the FO like to cover potential holes on the roster earlier rather than later, evident by a lot of their previous moves in the past.