I can answer the second question : you can claim the coins if you have at least 5 ETN.
For the first question, if I believe what I read, mobile mining is not far from airdropping, but I don't know much more. Not far from faucets finally, huh ?
I think ETN dump is due to the low amount mined in the first hours. If mobile mining gives good results, then it should go up again. I hope.
Saw people on twitter claiming to have over 10 ETN on the miner and it was not possible to withdraw, but maybe it's just fake news.
I'll tell you on friday.
Will wait for your feedback :)