Tom,
I'm not so sure the question is answered. There are alternatives.
First, consider that large BG are superb fly fishing targets. In small ponds, they offer great entertainment. They get large by having lots to eat, meaning that if large numbers of BG are present, you won't see the lunker BG. LMB prey on BG, and in the right balance, make both the BG and LMB larger.
If you are looking for great fly fishing, stock the LMB now and also regularly feed the BG. By late summer you will be catching respectable BG and by fall, 1 pounders will be common. You will also catch the occasional LMB.
Just depends on what you want...if you want good to great all around fly fishing, I would stock the LMB now. If you are after a few large LMB, then waiting may be the best bet.
One thing for sure, there's more than one way to skin this cat.
