I do actually like the idea of Washington as the greatest.
He did the most with the least and basically was a “gifted” amateur! He learned from every mistake and he made a lot in the beginning but the next time he was better & then learned some more from the next battler and was better again! If you break generalship into tactics & strategy, Washington was a superb strategist!
Two of my favorite and least heralded generals are:
George Rogers Clarke - another who did great feats with virtually nothing! He took I think 188 men and gained operational control of the Northwest (out to Illinois!) Did it in appalling winter conditions!
Winfield Scott - Landed at Vera Cruz out numbered, never lost a battle marched inland & took Mexico! Even Wellington said he was the greatest general of his time.
Never lost a battle even when outnumbered. Took Mexico. Gave it back because Mexico sucks.
Captain Robert E Lee played a large part in that success.