Responses
You also made a good point!
You can also easily guess when the UKE in the middle looks either at his Seme or is closest to his true love partner.
When you look at "Who is a sweet cheater?" the two Mls/Semes are kinda both equally close to the Uke. And the taller Seme who is actually the love interest target is on the left side.
Plot twist: The two Tops still share the bottom guy in Season 3: 7 Episode (Ongoing) 48~ !

Normally the true partner for the Uke is always on the right side of a bl triangle cover.
Maybe this time they are heading for a functional throuple or the author just wanted to put the end game Seme on the left side.