I don't know, I just feel like it's putting 2 and 2 together to get 5. Personally I think a much bigger issue yesterday was the lack of any sort of threat in behind, it just made us very easy to suppress and meant that transition was going to be slow whoever was in midfield. I'd pick Gomes over Sigurdsson every day of the week to be honest, but it's just one of those situations where suddenly he becomes a much better player in people's minds than he has actually shown for an awfully long time. Some of the worst midfield performances i've ever seen from Everton came with Gomes in the middle last season, I just find it odd that just a couple of months later people convince themselves it wouldn't happen with him playing.
I honestly couldn't complain with Sigurdsson starting yesterday. Gomes hasn't had one of his "majestic" games really since probbly Arsenal way (the sort of game where he seems to just look effortlessly above the rest). I think he looked tidy at times at Spurs and Palace but he really struggled in the derby. Sigurdsson has done well off the bench. Yesterday has probably taught us there's a world of difference between coming off the bench when we are winning to starting a game though.
There are some issues emerging from yesterday and that threat in behind was a big one. I've seen some takes that Iwobi was ok first 20. I really disagree, he was involved but he wasn't impressive. He as picked out on 3 or 4 occasions and did very little with the ball. He is primarily responsible for our lack of threat in behind, as he just doesn't want to run in behind, kick it out of his face and go in on goal like Richarlinson does.
Southampton started by doubling up on James, then crowded him with 3 or 4 as they knew his switch to Iwobi was pointless. He can't play wide in this team in my view, he can only really play inside and knit the play.
Bernard is also not a runner in behind really. Gordon is the closest to Richarlinson we have, so thats where I would look.
I really don't want to hate Iwobi, but he really does test the patience.