How do you figure this? Double the chances? Gyokeres has had 47 more shots than Chuba. Unless I'm just not following what you're saying.
His conversion rate is 10% better than Gyokeres.
Double the chances was definitely the wrong way to put it by me, probably the worst explanation ever, but send me the link to the stats and I'll try and explain with those numbers.
But it will probably be like Chuba xG 22, scored 28, so +6 (i.e 1.27 over xG), Gyokeres xg 19, scored 21 so +2 (i.e 1.1 over xG), so there's like a 17% real difference. If you back work that from say 28 goals, it puts Chuba on needing 22 to get it and Gyokeres on needing 25, i.e a real difference of three rather than 4.5 as it appears (only 1.5 goals difference, but a 33% difference)
Still a notable difference of course, but then if you factor what each of those have had to do to get those chances prior to them getting them, ie chuba hold the ball sometimes, lay off, arrive late in the box v gyokeres hold the ball every single time, fight two defenders and make a goal it's not going to be making his chances easier, he'll probably be knackered when he gets most of them. Again all minor stuff, but it all adds up.
Then couple that with Gyokeres 11 assists from effectively a lone striker (2nd in the whole league), to Chuba's 2 as a number 10 (doesn't make top 100) and that adds up, as does how they both impact the way each of their teams play.
Gyokeres played practically every minute of every single game too, which is some going for what he does.
I bet most teams would be better off with Gyokeres, but any would gladly accept either, and having both would be unplayable.