My approach to a crotch is to section, or split the log just to the side of the pith, with the pith being in the bottow of the natural edge bowl I' going to turn. I'll turn away the pith later. This puts the maximum amount of the "flame" pattern from the crotch where it will be seen in the bottom of the bowl. If I leave the two "branches" about the same length from the apex of the Y as the base trunk, I'll get a sort of heart shaped bowl or platter.
Hope this helps.
Whit