Yoshi's Epic Ya-- I mean, Wooly World

[Eno]

I just finished reading the story of New Island and yeah, that sounds like a pretty silly way to get the plot going again and it does retroactively mess up the first YI's ending.

I haven't played the game so I'll ask: how does time travelling Bowser and Mario fit into the mix? Does that come into it midway through the game or does adult Bowser really just randomly tear through the fabric of time to be a final boss?