As for Rogers, yes, any player who is not 'attached' to a team will not appear on Yahoo till signed.... Yahoo does not list players without teams to match to them.
Teixera has already been explained; as for the league problem: after this, whatever you decide, you might want to set up a league rule about this situation in offline drafts. Post it as a Commissioner's Note and/or email all the league members with it.
As for what to do now, Amnorix had good advice, but I'd go one step further. For Teixera and Rogers, have each manager pick, with your agreement as to appropriateness, a purely 'dud' player... someone of no value. For example, Albert Bell, retired from baseball but still on Yahoo's list. Of course, each would have to pick a different 'dud'.
They then must hold this dud on their bench till their drafted player appears on Yahoo's FA list, then they drop the dud and pick up the drafted player. (See below for one more detail.) This is made clear to all the other managers, and any manager who tries to 'steal' the drafted player when they show up has to immediately drop him or be 'locked' out of further play.
Why do this? It takes care (perfectly, I think) of the problem Amn. saw with his solution: the two managers who drafted unavailable players do not now get an extra 'slot' while waiting for the drafted player to become available.
"one more detail". The managers with the duds lose all preferential rights to their drafted players if they use their dud in any way. The dud must stay on the bench (reserve) until the drafted player is picked up. The one exception would be if the manager and another manager agree on a trade of the dud as a bench holder so the other manager can get the player drafted when he becomes available. This would have to be made clear to the league, and confirmed by the commish before the trade was allowed to be completed.
Hope this helps. Good luck.
amore cecidi tamquam blatta in peluim