I agree that it would have been more of a potential game-changer for CH to have replaced Ulloa with Locadia. But possibly, CH was so concerned to hold on to the 1 point, and sees Murray as a safer pair of hands [I mean feet and head! phew, hope the ref didn't read that] to defend corners and...
I think part of the problem is that, even tho the team and formation are fairly settled, its not easy to slot Locadia in ... there is no like for like replacement (methinks). He's not a pure winger nor a pure hold up/ heading striker. He's more of a second striker in a 442 or a floating striker...