The problem is that Basic Possession formulas (there are multiple) are essentially guesswork. This formula (which is the most common one used) isn't nearly as drastic as the one you posted:
FGA + (0.475 x FTA) - ORB + TO = 70.36 possessions per game for Locure's team & 53.59 possessions for Carton's team.
To this scale, Carton's stats would be: 31.7pts, 8.25 rbds, 1.7 steals, 3.93 assists, 4.32 turnovers
Compare that to Locure's stats of: 28.8pts, 5.3 rbds, 4 steals, 5.93 assists, 3.86 turnovers
Remember, we're talking about point guards here, not forwards lol
Thanks, I just used the first one I found on a google search. Notable that Carton's TOs are higher. With Locure having higher assists, steals, and lower TOs, I definitely can see the basis of your "better PG right now" argument.