I like Keefes willingness to mix of the lines when the team is not playing well, I like when he rewards his best players by pairing them with other elite players for a shift or two, Tavares, Matthews, Marner is a scary line.
I like the unpredictability of his mixing of lines. I like how he will double shift his best players towards the end of the period because he knows he has the intermission for them to rest.
He is a smart coach. Innovative and ever changing. Keeps his players on their toes and makes it harder for the other coach to line match.