To explain the T4 problem most tanks don't want to lock themselves out of T2 until they have cleared it for the week. So if 10 groups clear using the enrage strategy, 5 double heal, 5 triple heal then you would have 25 healers, 10 tanks, 45 dps that are then looking for a turn 4 group. To form those into T4 groups you could make 5 groups of 2 tanks, 2 heals, 4 dps. That leaves 15 healers and 25 dps wanting to do T4, but left with no tanks that have cleared T2. So they can either a) hope some of those players have a tanking off spec, b) try to convince some tanks to skip T2, c) hope they are part of players that actually get groups. For anyone that consistently Pugs T4 there are now far more groups forming for T4 then there are tanks wiling to do the content. On some nights on my server I see as many as 6 groups in party finder will full DPS, full heals and no tanks. So more than anything this is why I hope they do something to adjust the fight to require 2 tanks, no matter what strategy is used to beat it.