Why hasn't Missouri officially allocated its remaining delegates to Donald Trump yet? He won, didn't he?
According to the Missouri Republican party, they have awarded Trump 37 delegates and Cruz 15. That's all 52.
Because no candidate won more than 50% of the votes cast, Missouri’s 52 delegates were allocated to the top vote-getter in each Congressional District with a bonus to the top vote-getter statewide.
The following candidates won delegates in Missouri:
Donald Trump: 37 (12 for the statewide win, 5 each for Congressional Districts 1, 2, 3, 6 & 8)
Ted Cruz: 15 (5 each for Congressional Districts 4, 5, and 7)
It says that the Missouri Secretary of State has not certified the results. Perhaps another source is waiting for that to occur.