Maximum number of attacks w. Ferocity Form?

[Glabro]

Hi there, I was just curious as to how the Ferocity Form's (Juyo) additional attack plays out in the attacks per round maximum.

Is it mutually exclusive with something (speed, flurry, two weapons) that already grants an attack?

Is the maximum n. of attacks 6, then?

Thanks!

If attacks happened to be capped at 5, on the other hand, then this might very well be THE dueling form. Or, if if was mutually exclusive with two-weapon fighting.