What does “the only thing is” mean?

used before mentioning a worry or problem you have with sth

How is “the only thing is” used?

In Mighty Aphrodite (1995), one line is: “The only thing is, Len, he'd have to be as smart as me.”

The clip at the top of this page is from Mighty Aphrodite (1995).

The only thing is, Len, he'd have to be as smart as me.

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