If Ash is not as silly as everybody thinks, and he notices that Iris and Dento have something for each other, what would he spot first?
The first thing would be how Cilan seems to treat Iris. He seems to put a lot MORE emphasis on Iris' safety compared to Ash's in the series. Just like in the M14 example (my absolute favourite example), Cilan let Ash go to that dangerous, edgy cliff to save those two deerling, while he immediately stopped Iris from doing the same thing. Which should lead to future scenarios like this:
Ash: I'm off to get myself killed by falling off a cliff!
Cilan: ^_^ Have fun!
Iris: I'm off to pick an apple!
Cilan: NO, IRIS! IT'S TOO DANGEROUS!