Something I thought of, on a time table for Summerss/Tais' relationship they would have to of hooked up in a six month time frame for it to have worked. Like, six months after Raven left Tai, it doesn't make sense. He LOVED Raven, he would not have jumped to another girl that quick. And I think Qrow drinks to numb the pain of losing Summer, probably not to Tai anyway, which in of itself makes some sense.