the 764 has more business class seats than every other aircraft other than the 744, the 764 doesn't have 40 sellable business class seats since one has to be used for crew rest, and it also does not fly the Pacific.
How about you post the number of business and coach seats for each TPAC aircraft and let me know if your statement about the smaller business class cabin really makes sense?
There is a difference as much as 3 seats between the 332 and the 777, 333, and 763s which fly the Pacific (other than the few 25 seaters). The 332's C/Y ratio is higher than other aircraft including the 333 and 777.
iow, you made up a statement about the 332 being better for the Pacific because of a smaller business class cabin which isn't actually the reason at all. The 332 is used on the Pacific vs. the Atlantic where it was predominatnly used before because of its range and OVERALL smaller size.
In contrast, DL's intention to use the 764 to MUC esp. for a brand new route indicates their belief that there is a good amount of premium traffic. The 333 gives up a few of those premium seats but bumps up the total seat count and drives down the CASM significantly.