No, pretty sure you're right. Same thing with the magic stat, but more obvious.
Was something I was thinking about as I started a playthrough of P4G recently(first time since it had come out). It's odd that Chie doesn't get an extra weapon, unlike the rest of the cast. Yosuke's like doubles his SP, which is massive early on, and Yukiko's gives a big boost to SP too. Because of that, you use them way more than you probably should(think I had them on almost until the last actual rescue). You'd think with all the extra stuff they added for P4G, they could've thrown Chie a weapon early on too.