Overlap unless it morphs into a diagonal.

I THINK its morphing into a triangle... is that what you meant?
Something like this

Practice forward discerning probable patterns..

if an elliot wave pattern fails do you look for other patterns? like look to see if it is just forming a wedge, sym triangle etc and move on with the ta? What is your thought process when an elliot wave pattern fails for what ever reason (i.e. 3rd wave shortest, 4th wave crosses top of 1st)

Since EW is a probabilistic method, if you primary count is incorrect, then one of your alternates will be. That's why an Elliotician is rarely surprised

Wave 4 cannot overlap with wave 1.