No I mean I just don't remember Adachi having that much offense period, much like how Jin/Takaya from P3 didn't come close to how good they were in the stat topic for P3. Well, not THAT bad, just kinda a nagging 'that doesn't seem right...' rather than a 'ha ha no'. I was probably a bit higher on level. (I know I didn't even bother keeping Adachi under debilitation, as a side comment. That should speak volumes)
Regardless, Arche goes first (average speed > goes last phase based), so Meteor Storm -> Adachi Heat Risers -> Meteor Storm -> Adachi attacks -> Meteor Storm. I don't think Adachi takes 3 Meteor Storms, even if two of them are while he is Heat Riser'd. His magic durability isn't good. HIs physical durability is, but not his magical.