i feel like blaziken needs a spec move somewhere, but the main walls of this gen are still severely hurt by him but v a max def gliscor and a cs blaze can only do about 49-57% with blaze kick and LO.
Thing is, no one runs max Def on Gliscor. It's always Jolly with 4 EVs in Def. Against this, Blaziken will always OHKO with a +2 LO Flare Blitz, so he actually does well against it. However, based on these calcs now, I predict Blazikin will have to be one of those suicidal sweepers.
Though, a mixed Cheer up set may be the future for blaziken, as with Speed boost buffing it, it can afford to invest on both sides of the spectrum, ideally coming in on a locked pursuit or something, and taking the turn to either sub or use cheer up. If it subs it can get +1/+1/+2, effectively outspeeding just about everything, and killing a lot.
Also looking back at Lee's set, that does seem pretty nice, though something worth noting, you should pretty much always use HJK when you think your opponent will switch, as the pokemon Lee compared Fire Blast against actually take more from HJK, even though you risk hurting yourself. Also, Neutral HJK does more than SE hidden power, just something to keep in mind.