Frankly that's drivel, there is a legitimate argument that Wellington wasn't the equal of Napoleon as some people claim but the idea that he was some kind of third rate Sepoy General is just silly. If you don't believe me look at Napoleon's genuine assessment of him, not morale boosting quips.
Also remember this, Wellington's abiding flaw was the he was overcautious, Napoleon's that he was a gambler. Wellington never lost army, Napoleon went all in numerous times, sometimes (Austerlitz) it paid off in style, on the hand first he lost his Nile Army, then he lost his Grande Army in Russia and then he gambled at Waterloo ending it all.