Might well be fitness issues with Alex. He withdrew from the first week's futures and for this one he maybe didn't expect to be ready and / or is easing in gently with doubles.
I assume it is all down to the late cancelled Challenger in the States during this week which then ended up being moved to Bangkok. I assume Alex/Luke either didn't get notified soon enough to enter or didn't see the announcement in time. I don't know what the notifications about cancelled events are like.