My guild has had attendance problems, to continue with progression we found another guild at our level of progression with similar issues and there has been a merger. This has left us with an excess of Raiders and 3 main spec tanks. Most fights in Ulduar require only 2 tanks, how would you handle raid composition for 1-2 tank fights if you had more than 2 main spec tanks and there are DPS on standby. Do you make them sit or switch specs? How do you decide who sits?