I was looking at the bite mark. I'm clearly no expert but bear with me. There are a total of eight upper row teeth and seven bottom row. Now count your teeth. On average, you will have nearly twice that many (16 upper/16 lower). Next, notice how close the top and bottom teeth are together in the bite.
So there seem to be only two real possibilities here. Either the pictured bite is actually from a small kid (10 upper/ 10 lower) and was taken later as part of the plan. I'm thinking basic dental records could easily dismiss that evidence.
The second and I think more likely, is that Puka sucked on her shoulder and then bit down to leave an impression. In this case, he would have to suck hard enough to draw up the flesh deep into his mouth which wouldn't exactly be like a quick, surprise bite. But it seems that would be the only way he would leave a bite mark like that. And sorry but I don't see anywhere that it "broke the skin". My guess is that it was like a "ha ha, bite me" type drunken affair in a party van after he had supposedly just bitten the thumb of another girl - probably also leaving a temporary indentation of his teeth.
Now these are just my guesses. I would think there would be eye witness accounts as there were obviously more people present. Regardless, Puka needs to have a buddy that he trusts to go with him when he wants to party and that person has to be a good enough friend to stay sober and have the trust of Puka so that he can head off trouble. That is on Puka. It's something I personally (yes - IMO) think the Rams should somehow require of him before giving him a guaranteed huge contract. At minimum, they should rightly have an enhanced conduct clause in his deal.
I personally think this is a shake down. But I also acknowledge that Puka needs to wise up and quit being young, dumb, and full of cum. He is on the verge of being a multi-millionaire and only he can derail that and only he can get in front of these issues. People defend it as that he's a young superstar and is just doing young superstar shit. Welp. I hate to break it to the young lad. He's not just some 20 something kid out there. Along with a huge contract comes obligations. I'm thinking the Rams wait at least until the dust settles before they ink him to his next contract - and rightfully so.