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Sixty five words hold A second and V third, and the fourth box is the narrowest part of the pattern.
E alone takes thirty nine of the sixty five, sixty percent, with I on twelve. Between them they cover almost the whole group, which makes the fourth box the most predictable one here.
SAVED, FAVOR, WAVES, HAVEN and NAVAL are the everyday members, with RAVEN, GAVEL and NAVEL close behind.
The last box is where AV words actually differ. S closes sixteen, with N and R on eleven each and D on eight.
So the useful work is at the front and the end. Guessing the fourth letter tells you almost nothing you did not already know.
They share the A, V and E, so they test much the same ground. HAVEN differs at the end, where N covers eleven of these.
A wild turnip. Its W ending is an unusual shape for this group and not one to guess early.
Two do. SAVVY and NAVVY both repeat the V, which stands out given how few letters follow it.