Don't agree with this at all. If anything, his goalscoring record in the Premiership shows that "end product" (by this, I assume you mean "finishing ability/goals") is one of the things he definitely does have. I don't see how you can look past a guy with his record, and then go and nominate both Crouch and Heskey for your potential squad.
Outside Owen & Rooney no other striker in the land has the end product to be successful @ internatinal level despite what they do in the premiership. But the difference between him & Heskey/Crouch is that at least they have done a job at times to compensate their lack of goal-scoring ability which is to be nuances to opposition defenders i.e Owen/Heskey partnership (pre EURO 2004 & latter stages of Euro 2008 qualifiers) & Crouch damn he works tirelessly his performance vs Croatia @ Wembley convinced be enough he can do a useful player. Would expect Ashton based on what i've seen of him to add some goal-scoring ability to the physical game the he could bring up front for ENG in the future once he stays fit since he seems to get injured alot.
With Defoe all he does when he comes on running all over the place & when he gets anwhere around the penality area he looks woeful
Yes, they're a different type of player, but if there's one player in recent years who has had too many chances at international level, and who hasn't delivered enough "end product", as you so vaguely define it, it's Emile Ivanhoe Heskey. Crouch, equally, has yet to really impress at international level against a team other than Jamaica.
As i just mentioned Heskey may have gone missing but has done a job so has Crouch. Defoe has not & don't ever expect him to @ the international level.
As for "wouldn't have much trouble handling him", again, I point to his goalscoring record in a Premiership that's full of some of the world's best defenders.
I'm struggling to find a solid central defensive partnership outside the top 4 now or in recent years outside the BIG 4 tbh, although potentially Tottenham with Woodgate/King could be very solid, Campebll/Distin & maybe something Leeds United had when they did well during that CL run in 01 (ok i guessing now)
But anyway his record aint all that impressive:
West Ham 99-04 - 29 goals in 93 matches
Tottenham 04-08 - 43 goals in 134 matches
Pompey - 12 goals 8 matches
Only in his short stint for Pompey so far has he scored heavily but most of his goals where scored againts average premiership sides expect for Chelsea who i remember at the time where going a bit of sticky period.
But regardless i really couldn't be bothered about what he has done in the league since he has proven to be useless againts decent/quality international teams.
Look way back in the days around 2001/02 probably when he first came on the scene i had high hopes for him i remember joking he'd be better black player than Barnes after seeing him score a goal againts United around that time, but damn seeing him for ENG i take it back..
It just seems here that you've decided you're not picking Defoe and that's that, you're not looking at the facts. I just don't see how Defoe is any less proven at international level than Crouch, Ashton or Heskey.
In comparison to cricket me not rating Defoe or not wanting to pick him is similar to ENG and Ramprakash ATM. In that he may be scoring heavy runs but given his past exploits againts quality oppositon one isn't that fussed to pick him again. Not a perfect comparison but you get where i'm coming from.
While me going for Crouch or Heskey would be similar to IND if they wanted to recall Akash Chopra if another one of Sehwag's partners failed. In that Chopra may not have dominated attacks (Heskey & Crouch may not have scored goals), but as Sehwag partners he did a crucial job (similar to what Crouch/Heskey have done) of giving IND crucial starts & not exposing their talented middle-order to the new ball ofen (see 03/04 season vs AUS & PAK) until he flopped.