If you are the betting type, I would guess the line just changed substantially in the last hour with Giannis being declared out for a sore calf.
No Giannis, Middleton still on a minutes restriction, and no Jae Crowder. That is every veteran they have that remains a competent wing defender.
A lineup of Lillard, Beasley, Portis, Lopez, and Connaughton (for the almost 30 minutes a game Middleton is off the floor) might be worst perimeter defensive team the Bucks have sent out there in the last decade.