not necessarily. you can get to 30 solo with a whm sub, it just takes a lot of planning. really you could sub anything though. i've seen a couple bst/brd, and bst/nin who were pretty well respected, but i've only ever been bst/whm, so i can't say for sure. why not test some of the more obviously possible jobs out? B/c of the loner lifestyles of most bsts, they're probably the least understood job.