kwaw
...but seems to me that if we go simply by logic, Aleph should be very properly One, both because of its value and because of its position at the beginning.
But that logic breaks down after 10 anyway - a number based correlation is alway going to be makeshift - the logic of making fool 21 (or 300) or 22 (or 400) is no more or less logical than it being one. I prefer to make the correlation on the symbolism of the letters and the tradition of alef being an exception among the letters (being that from which all the other letters emerge) and the fool being the exception (the fool and 21 trumps). For example in the myth of the letters being first 'in creation' or in the torah, Alef remains silent before G-d (the letters being addressed backwards from Tau to Alef and stopping at Beith 'the first in creation'). According to Cordovero Alef is the letter from which the others emerge, and the rest are split into 3 groups of 7 (similar to how the Fool is an exception and the 21 trumps are frequently seen as being split into 3 groups of seven). According to Cordevero the first 7 seven letters (starting from Beith) belong to the rule of grace, the second group of 7 to the rule of love and the last 7 to the rule of judgment.