Betta Fish: Is this betta a male?

We bought some female bettas a few months ago, all were a similar size and not the healthiest looking of fish. Now they are all much healthier and doing well, but this one has changed dramatically in the last month and I’m questioning if it’s male. I can easily identify an egg spot on the others but struggling with this one. It’s also very territorial, but so is one of the others which is definitely a female. It’s the long fins that have me questioning it, I have never had female bettas and I don’t know if long fins in females is a variant.

TIA.