Welp, Kog is the least picked Marksmen again
The only changes presently on the table are some monkeying with his Ult to make it slightly less useless against healthy targets and significantly worse as an execute, in particular its scaling is taking a shovel to the face. Said changes do absolutely nothing to push Kog toward the niche he supposedly fills, that of a champion designed to make high utility, low damage team compositions shine.
So how about a suggestion?
Focus Kog more heavily on his resistance shredding/damage amplification. If he were focused on amping damage, that would allow low damage/high utility teams to really shine since Kog would be utterly wrecking enemy resistance. He already has the strongest hybrid shred ability in the game aside from Trundle's Ult, so why not just go crazy with it? His long range machine gun identity already fell through.
His artillery platform identity was intentionally killed by Riot. That just leaves his resist shredding tank-buster identity. Give him a new passive focused on shredding resistance. Tweak his Q to make it more viable for spreading resist shred around. And if Riot doesn't want his Ult to work as a poke, why not give it lowish base damage and a debuff that procs additional damage when an ally hits them? That would mean follow-up is required.
Riot has been consistent about what they think Kog's identity is. And they've been just as consistent in totally missing the mark every single time they've made changes to him.