I recently looked at the spot JT4 rainbow UTG vs CO SRP. UTG will check 66% of the range which makes sense. Board is quite equalising but UTG can push a slight equity edge with his OPs. However after a CO 50% bet UTG never raises. Of course 50% not the size recommended in theory but it's one I face a bit in practise.

I would guess that most CO cold callers are weaker ( especially if they go 50% OTF) and will overstab this flop so check rais