YAC Consensus

Hello all,

I am reading about Iroha project (Hyperledger) and I saw that they use the YAC (Yet Another Consensus).
I try to understand it fully and to get an idea if it is a good consensus or not.
For what I learned a single entity decide which tx to put on a block and then send it to the peers. Then the peers send their blocks to a leader and by a way of voting, the leader chose the next block to put on the blockchain.

Why not for the leader and the voting system but why the peers cannot make their blocks by themselves like in PoW. Isn't it too much of centralisation in the owner of the single entity making the blocks to broadtcast to the peers ?

It is probably a newby question but if someone could help me get it right it would be very nice.

And, do you know other project implementig YAC ?

Thanks guys!