This is my reservation. Gyok, Simms and Cannon were all on broadly the same scoring pace in the championship and we wouldn't consider the two we already have to be nearly ready to be a starter. Know there's more to it than just scoring but 1 in 2ish in the Championship is no predictor of great things in the PL.
We need more than goals from a striker. Even if they’re fairly lowish scoring they’re still a huge impact. Look at Dom, hardly scored last two years but when he’s playing we’re 100x better. That’s why Gyokeres would be a good buy and why Simms is awful.