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Sixty five words put B first and N third, and only vowels appear in the second box. Past that restriction the page spreads out very evenly.
U takes the second box in seventeen words, A in sixteen, O in thirteen, E in ten and I in nine. Nothing else appears there at all across the whole sixty five.
Branches sitting that close together means no guess in the second box eliminates much. It does tell you the answer is a vowel, which rules out a lot of instinctive first tries.
S closes twenty one of the sixty five, thirty two percent, and Y another twelve. Between them they take thirty three of the page, far more than any second letter can claim.
D leads the fourth box on fourteen words, giving BANDS, BENDS, BINDS, BONDS and BUNDS. That family alone shows why the vowel is the least useful thing to know here.
Eight words repeat a letter, mostly the doubled N of BANNS, BENNE, BONNE and BUNNY. A visible repeat narrows the page usefully, which the second box never does.
BENCH or BONUS. Both are common, both avoid the crowded D family, and between them they test two different vowels and two different endings.
The stem takes every vowel. BANDS, BENDS, BINDS, BONDS and BUNDS are all on this list, which is why the second box alone can never finish the job.
Yes, it runs B, A, N, J, O. The J in the fourth box is unique here, so guessing it either wins outright or costs you a turn.