Despite AT&T’s best efforts, no one has wanted to take Xandr to the prom. Potential suiters have come and gone for the best part of a year, but it seems no one wants to acquire an advertising technology vendor that has been caught in an identity crisis, juggling display and video advertising capabilities. Rumors last week suggested that Indian ad tech unicorn InMobi was in early stage talks to buy Xandr. The company specializes in mobile display advertising, which suggests that an acquisition might return Xandr to its roots and cast off AT&T’s huge efforts to incorporate video. Common sense would suggest that InMobi is looking to acquire the parts of the business that operate mobile and display ads. Perhaps…