Actually disagree (re him not knowing), its funny the comparison doesn't come up more often.
Jenas is actually the closest player to Dele I've seen play for Spurs (or anyone else), try not to compare to your perception of JJ, compare to the JJ we saw in a lot of games against the Scum, an attacking midfielder (who didn't completely shirk defensive duties) with great athletic ability, great engine, skill on ball and a goal scoring threat.
JJ's issue was lack of drive, he was comfortable in his level and at club. To be fair to him, that was an issue/attitude that applied to more than just him at club (Lennon is the other prime example). A young JJ & Lennon under Poch would probably have turned out very different.