Like my team Barca shirt sponsor for sure everyone knows before but not everyone knows now the main sponsor is Spotify (on the shirt).
But everyone still knows Rakuten is STILL major sponsor as well as Nike, even though you can't easily see these names on stadium or on shirt (anymore).
And how many ex Gunners already not just facing on ads but even appearing on Sportsbet radio show, you bet this is something big!
I think it's clear that the sponsorship of Southampton is the bigger one there, sure Arsenal is the better team, but because it's just a major sponsor, one of many, I think that means hash clash should definitely be Southampton vs Everton, that would make a lot more sense. If you want, you could ask them to do something about Arsenal vs Everton as well, but I would find it not appropriate when Southampton is there.