Why wait two hours to fill a group? Give it ten minutes and then go in with whatever you have. As long as you aren't being restrictive in who you want, aren't looking for a "perfect party" and are in the general level range of the quest then there really shouldn't be too much of an issue. I think the longest I've ever waited for groups was during the pre DDO:U doldrums, and even then I had just two incidents when I couldn't fill a group and went in solo instead. Especially for Tears of Dhakan, any party makeup will be fine. No "healer"? Heal yourself. No casters? No problem.