Cylinder #7 down on compression

I'd test #5 ring by moving the piston about 1/2ish way down, or in a position so another piston is about equal distance down, as best possible, then pour equal amounts of clean solvent/varsol/ diesel in each cyl .
Wait. . a coupla hours . It's not uncommon for the liquid to diss-appeared/drain relatively quickly in one, as compared to the other cyl.
Not uncommon for some cylinders to hold fluid overnight.
We do this on every valve grind, test ring seal.
Oil change mandatory. ! !
Cheers