Both of these items are tagged as unique(almost all non-tradable minions and mounts are), so anyone who already has one cant roll against you for another one. They also both drop every run(Calofisteri didnt used to), so typically you end up rolling against half the group or less. I wouldnt hazard a guess how many it would take to un-sync Wheeping City, but i cant imagine its more then 4 per group. Still though, just continuing to run it you will likely win it sooner then you might think. But Alex? Assuming this is the Toy Alexander from the Soul of the Creator instance, THAT one is soloable. A level 80 tank in appropriate gear might be able to handle normal mode as is, at 90 you can pretty easily solo the savage version(and claim the mount!). The tricky part is actually the time travel mechanic(the most important mech in both normal AND savage mode). You need to enter one of the 4 portals and kill the add on each of the 4 platforms before they wipe the raid(you). Beyond that? Any tank in decent gear will have no trouble keeping their health high enough. Burden of the father and burden of the son are both also easily soloable in normal mode. Burden of the father(savage) CAN be solod, but you need a class with VERY strong burst(personally i did it on BLM with some crit luck). When you get to the 3rd leg, you need to kill it(its something like 400k health) within the space of 2 GCDs or it triggers a mech that can not be done solo and WILL kill you. Ive yet to find or hear of a way to solo Burden of the Son(savage) - when you get to the last phase the very first thing wipes you and it still has more then half health.