Perhaps he means Hakkinen. Well, McLaren tried giving Mika another go at Barca a while back and it became apparent pretty quickly that he'd lost it. Unlike Schumacher, who jumped in after retirement and was immediately fastest - a piece of driving as impressive as some of the best in his championship career.
Hakkinen was out of Formula 1 for six years. What did you expect given that the sport develops so fast and that he completely changed his driving style to suit DTM cars!

“I think Michael’s presence at Ferrari is a compliment to us,” said Hamilton. “We are not doing that and we are still winning races."
It is a compliment to McLaren, or himself, or both, but Hamilton's actually complimenting Schumacher as well, saying that Schumacher motivates him etc. Further, what did Schumacher do at Ferrari? He worked incredibly hard to keep himself in top condition and did a lot of testing of his cars to get the maximum from them. Hamilton believes he can do that as well: Hamilton does keep extremely fit and does a lot of work for McLaren and himself in and out of the cockpit.
“I think Michael’s presence at Ferrari is a compliment to us,” said Hamilton. “We are not doing that and we are still winning races.
“When we go to a test, it is cool to be on the track the same day as him. For me, it is even more of a challenge.
“Michael is someone I have been watching for years, but I can do just as good a job as him and my task is to contribute as much as he does.
dont speak too soon young fella these drivers of the past have had mistakes and theyve learnt from them and couldnt be stronger as a result, give yourself 5 more years till you can compare yourself to past heroes.
i dare you to say your better than gilles or ayrton, and i swear you will not learn from a worse mistake in your entire career. you will be held down from the title until you lose interest....or your edge
I agree. It is far, far, far too early for Hamilton himself and anybody else for that matter to compare him to legends such as Senna.

Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008