C needs to be able to fight. I have always hated making the best player the captain. There are a few exceptions, like Lidstrom, but for the most part the captain must be able to get dirty in the trenches. Crouse is ideal.
I understand the sentiment, because our longtime beloved C could and did, but I'm not sure it's always the case (i.e. more than a few exceptions)... here are the number of majors taken career by the current 24 Cs, and I would say some of the lower numbers are good leaders, too:
FLA Barkov 0
DAL J Benn 34
NYI A Lee 13
BOS Bergeron 2
OTT B Tkachuk 27
SJS Couture 3
PIT Crosby 7
NYR Trouba 19
CBJ Jenner 8
TOR Tavares 1
CAR J Staal 5
LAK Kopitar 0
BUF Okposo 4
COL Landeskog 17
DET Larkin 8
EDM McDavid 1
NJD Hischier 1
WAS Ovechkin 7
NAS Josi 2
MIN Spurgeon 0
TBL Stamkos 5
VGK M Stone 5
MTL Suzuki 1
CHI Toews 9
For the record, right now it's Crouse 18 and Keller 1.
I voted Keller, but I'd be fine with Crouse, no doubt. I know there are others with that nickname "the Sheriff", but I really like it for him, and it works in a place like Arizona with our old west history.