Sounds like you had a bumper crop of LMB last year with a little help from the southern naiad. At 2-3" I would consider them as part of the forage base for your initial stocking of LMB. Once this crowded year class hits the 8-9" mark I would start agressively culling them as they will be too big to be considered forage. Until then they can help thin down your small BG numbers which I assume also had a bumper crop as well.