Possible that some manes are, but not all. Some are as mythically important as your average unrecorded High King of Skyrim, and perhaps only one is on par with the status of the Emperor. Also, the Khajiit may be individualistic and revere thievery, but this is not necessarily true of the Mane. I see Manes as more a principle that unites the Khajiit rather than encouraging them to divide and find spiritual meaning within theirselves.
I reckon that if we're considering the Khajiiti heroes as Shezzarines, we have to break a lot of rules and assumptions to do so; some, like the temperament or goal of a Shezzarine, are already a mess due to the connection between Nordic and Cyrodiilic heroes. However, the Mane is notable for not being an incarnation or devotee of the obvious Lunar figure in the Khajiit pantheon (Lorkhaj). Lorkhaj is a demon; as for the "focus" of the Mane as a Shezzarine, far better candidates are Azurah, Nirni or the Ja-Kha'jay - or possibly, at a stretch, Alkosh.
I'm not saying we've no reason to call the Mane a Shezzarine; but if it is, it has the unique quality of being Lorkhanic from an outside perspective without carrying that meaning within their own pantheon. From a Khajiiti perspective, it seems more reasonable to me to call the Mane a god of the Khajiit themselves, rather than Lorkhanic motive on Nirn; and the highest god in the Khajiiti pantheon appears to be Azurah. The Mane-Lorkhan connection can be salvaged, perhaps, if Lorkhan is not Lorkhaj, but rather Fadomai, and Azurah plays the role that Boethiah does in the Dunmer system.