Is HP the most important stat for Zapdos?

I was messing around with breakpoints and pretty easy to reach highest breakpoint for charge beam versus ho-oh, articuno, etc. Even 11 attack stat reaches maximum damage at about 31.5 if I remember correctly. Of course charge move increases incrementally but it's such a small percentage..

For defense, confusion fast attack on mewtwo is the only one I found that a 14 or 15 would be good to reduce fast attack damage at level 37 or 38. ( I wouldn't use on mewtwo but trying to find extreme examples. )

This was just a quick and dirty run through some numbers.

I realize that eventually there will be new bosses in gen 3 and 4, etc but am I missing something critical in analyzing best Zapdos to power up?