BOO?

[chasbo]

Did a JV game yesterday and the home coach says he's substituting for the flex and I say OK. After home team bats he says to me that the sub for the flex actually batted by mistake. Since visitors didn't notice ( how did they score the at bat?) I let it stand and obviously told him to correct his mistake. Since the flex is in the 10th position, and the sub batted the correct batter should have been B1-lead off batter. Had the visitors caught this in time the lead off batter would have been out and B2 would have been due up correct?