I completely agree with you about mismatch issue. The nature of isolation offences is based on 1 on 1 skills, regardlass of whether inside or outside oriented. Therefore one should pay an extra attention to DR, more generally players ability to create his own shot.
Then question arises, which skills are crucial or determiner to create one's own shot?
1. First and foremost skill is DR (to beat defender)
2. IS and OS (to take advantage of mismatch and to acquire relatively high FG percentage)
3. HA and PA (to avoid turnovers when facing a top class defender)
In terms of BB, inside/outside means only which player on the pitch will be chosen to perform isolation offence.
It certainly does not mean the area from which shots will be used, this is why both II and OI are classified as neutral-focused offences.