Whispy Woods' acquired ship piece could probably not be his fault. When they were flying through the air the oars could have landed in his branches. He attacks Kirby on sight because he doesn't like him; and when he is beaten and does a Chain Reaction Destruction it knocks the piece out of his branches.
The Plasma ability's merged with the Spark ability in this game. This isn't much, unless you realized via a Genius Bonus that Electricity's made up of plasma. Thus, Plasma ability merged with Spark the same way Burning merged with Fire and Freeze merged with Ice.