PoA stakeholder can pretty easy split the network and make a double-spend (?) :

1. he makes one  block with his own transaction to merchant and sends this block to the merchant.
2 immediately creates the second block with a double-spend transaction and sends it to other peers.
3. The first block will be orphaned with a high probability, so as merchant's tx.
So we are planning to return the ability of choosing the tx set back to PoW miner. Can you, please, comment it? Thank you.

Also much appreciate any other ideas to implement on the top of XDN blockchain and deposits. Now we are ASIC-resistant PoW with an original PoW initial distribution, but PoA will make XDN much stronger against 51% attack, but we should consider all options.