Indeed, when picking his combined north London xi, the pundit suggested the 20-year-old defender is an easy choice instead of Tottenham's Walker.
Nicholas believes Bellerin is faster but also better defensively than his Tottenham counterpart.
And that's why the Gunners youngster is a straightforward selection for Nicholas's team, even if he is a little biased...
He told Sky Sports: "It's an easier decision at right-back, with Hector Bellerin probably as fast as Kyle Walker, if not faster, but more controlled.
"I just think he's adapted brilliantly to the Premier League, the way he protects his centre-backs is getting better, while Walker hasn't really developed that side of his game."
Bellerin's pace has ensured rapid progression ever since his days in Arsenal's NextGen side. But Nicholas's observations are interesting because defensive nous comes separately from speed.
Walker has certainly improved for Tottenham this season but many remain unconvinced of his defensive ability.
The problem both Spurs and the 25-year-old have faced is a lack of competiton. DeAndre Yedlin was loaned out and Kieran Trippier has failed to live up to expectations since moving to White Hart Lane this summer.
But Walker's own deficiencies, at least according to Nicholas, make him inferior to an Arsenal full-back five years his junior. Although that particular youngster is a very good full-back...