Check out my analysis on Trundle Support after Yellowstar picked it for Fnatic last week! http://www.goldper10.com/article/2066-trundle-support-will-it-work-for-you.html
TL;DR: No.
Here is the thing, for that comp and what the meta is, trundle was a pretty damn good pick.
FNC was using a carry top, so they had a triple threat damage, the only real thing that could hitch the plans is a tank top laner that could eat all the damage, so you bring in Trundle to destroy the armor/mr and be a minor tank ala Alistar for a little bit, long enough for them to eat through said tank and then destroy the rest of the team. If SK counter picked another damage top laner instead of maokai, Trundle would have been 5 kinds of useless outside of clutch pillars since his ult wouldn't have been useful at all.
TY Elements.
