Its very hard for a lvl 100-150 to complete these weekly missions because of the energy requirements.I'd like to suggest a lvl based energy requirement.For instance a lvl 500 should pay 50 each round, a lvl 1000 100 for each round and so on (just an example).Lvls under 100 should have 20-25 like it was before so that everyone would have a chance in completing them.

They get archived at the end of the chain with your progress saved so you can finish them later. I'm in the 840s and I don't have a couple of the chains done yet. It's no big deal if you don't get them done in the 2 week timed release.

the weekly missions are a new release and will later be added with the progress you made to the normal missions you are already doing , so no the energy will not be changed for lower ranks