No need to exaggerate. Theoretically you can easily fit the opening rotation in with time to spare before MB is available to use again. Even allowing for lag you're still likely to fit it in without problem.
Potentially with raid buffs, and almost certainly with heroism, you can fit a SW
in before MB becomes available again, or delay MB by only a fraction of a second. Note that I did say 'sometimes' in my original post which you kind of ignored.
Consider also that you can clip MF at 2 if you wanted to, though this is something I generally only do so when movement is necessary.