Is it possible that what Gabriel passed along was "adapted" by the one who received it to fit his purposes rather than His will?
We humans are very good at that.
No, I don’t believe Gabriel gave any revelation to Mohammed. God usually entrusts those kind of revelations to holy men, or at the least, men who receive those kinds of revelations quickly become holy men once they experience the divine firsthand. Mohammed was many things, but he wasn’t holy.