Still the idea always was to make a deadly duo with Drogba, not to fight with him over a spot.
Yes he had a bad WC because of injury, but I wouldn't read too much into it. alot of strikers, even the ones at end of your post, deal with them regularly. His lack of confidence however, did take huge blow after he moved to chelsea, and found himself in some difficulties and at the same time liverpool ,with some changes, 'looked' competitive again, the reason why he left them at the first place. .
Obviously if he was to come here, he should take a massive pay-cut, same goes with Dzeko.
and

to bolded players, not sure if we'd be able to enter a bidding war for them tho.