Even no disbalance in PoS.
He simply alter source and use PoW so it's only illusion.
This coins unspendable.
Where hi get 20 coins from?

Check code.
==================
main.h

27 static const int64_t STATIC_REWARD = 20 * COIN;
==================

But as nodes have right client they never accept that.
Actually it's known attack but he need 51% of all network for success.
Unreal.
Second thing orphans. I think that a lot of orphans because another new coin use same ports. 7117,7118
I post about that, see post #664
Block timeshift can be corrected too. It's not a big deal.
I hope developers will fix that soon. In my opinion even not needs to do hardfork.
About exchanges. I think no needs to disable deposits and withdrawals because market will go down soon.
Nobody need coin that can't buy or sale.
Tell me if I'm wrong.