some of these team Marin s did come with the sugino cranks instead of the white industries crank,there is a team marin now for sale on ebay with the same sugino crank fitted as mine ,check out below http://www.ebay.co.uk/itm/Team-Marin-XC ... m1e72d79fe
Nah, that an component replaced bike from a different year (by the colour of it). You cannot compare other years to yout years bike.
It will have had WI branded cranks on it.
Shop as mentioned will have pulled bits off if somebody wanted to buy them, then fit something else on it in it's place.
It'll then have been sold end of season or through the next years at a reduced price.
As for the Brake Shifters, then if you really want I would get the XT the brake levers and action is much better. and with Marin lite canti's you need all the help you can get.
but by the sounds of it's intended use, why bother.