I disagree. I've used Kenny Cr to great effect, especially with the Huracan. Doesn't matter if you have six power when you have the best equalizer in the game as a bonus and you can win a match single-handedly.
I like the deck. I think Cutey is trash though. You may say "why Kenny Cr but not Cutey" and, well, Cutey has the same problems as Kenny Cr, but without the massive pay-off so she's not worth it while Kenny Cr is or can be.
I like your deck otherwise. Just switch Cutey to Edwin and I think you're fine.
Not with 6 power alone, not with the abundance of 8 power cards, not with the abundance of 7-8 power cards with some kind of attack/power manipulation ability.
Chances are, most modern hands will have multiple ways to deal with Kenny Cr, and for him to hit with his standard damage (let alone fury) is, more often than not, going to be too expensive to be any kind of guarantee.
He used to be a threat back when the power levels were lower on average, and there will certainly be certain hands that he becomes more threatening in, but those days are gone and those hands are too few for him to be consistently strong enough for his threat potential to matter.
Nightmare have a few decent 3*s, but Pan is the only really great one. Sagh is decent.
Timmy, Edwin, Cutey are all usable but feel a little lacking.
The best ways to build halves with the clan, IMO, are:
Depending in the other half.
Of course, this is just my opinion. Others might do much better than me with the cards I ignore.