Well Fleery...
Perhaps you should be instructing your students better!
Last Wednesday (6 Jan) I was up in a PA28 doing some x/wind circuits on 31R. In the pattern were 3 "brand new" C172's doing circuits. All 3 were on very wide downwinds, and also turned base pretty late.
Even without the 15 - 20 Kt westerly, NOT ONE would have made it back to the field with an engine failure. With the westerly, they'd have been lucky to make boundary road.
NONE of them were pushing into the westerly, giving them a much longer base than crosswind.
(To paraphrase) Fact of the matter is YOUR standard circuit is ALMOST ALWAYS OUTSIDE other aircraft at MB.
DIVOSH