Amateur night at the field

John S. wrote:

"enter upwind crosswind behind any traffic already in the pattern"

It's the "upwind crosswind" part that doesn't make sense to me.
Regardless, I don't think entering the pattern above pattern alt. is a
good idea.

AC 90-66A says "Arriving aircraft should be at the appropriate traffic
pattern altitude before entering the traffic pattern. Entry to the
downwind leg should be at a 45 degree angle abeam the midpoint of the
runway."

That works for me, no need to re-invent the wheel.