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I actually never noticed that until you mentioned it :)
All hard, soft and "normal" consonants CAN be aspirated and it will not be incorrect pronunciation

pronunciation of Ы sound is similar to maoin in Irish language and you may know that this is exactly the sound which doesn't exists in English as Irish people say, so there is no English similarity...

This is incorrect
here are two words
Пьеро and перо. First word means Pierrot (as a name of a character) and second word means feather
Those words pronounce differently

I think this is incorrect
й has its own sound it is the sound of "y" in the word yogurt