Stamina (how many pitches he can throw during a game) and durability (how quickly he recovers between appearances) are only levers on how many innings he can throw, not effectiveness.
The primary ratings I look at for effectiveness are control, vL, vR, and pitches 1-2 (not in any particular order, though I'd say vL is the least important of them, IMO). They all work in conjunction with one another. Which means one of them being low can be offset by the others being high.
The secondary ratings are the other ones, GB/FB and the other pitches.