This is my gut feeling, too.
In my opinion, Trump is an asset in the sense that his words and actions, due to his personality flaws, make it easier for Putin to obtain his nefarious goals.
Not in the sense that Trump’s an actual dedicated Russian agent.
I know stories about Trump’s involvement in Russia go back decades, well before he was in politics. I’ve heard every kind of rumor—-I stress rumor as I have only links to rumors, not verifiable—-money changing hands to bribe Russia so he can build there, or that Putin has a sex tape of Trump with a Russian prostitute, and other tenuous insinuations.
What I believe is a potentially accurate concern is Trump hanging out with Putin at the Kremlin, like the buddies he thinks they are, and he mentions or shows classified intel to Putin.
I know Trump doesn’t drink alcohol, but maybe over a cup of tea or can of Diet Coke, he will just blab about some military secrets or something similar that will jeopardize America and the West.
I think he’d be motivated either because he’s bragging, (“hey, look what I’ve got”) or because he genuinely trusts Putin to keep a secret.
Just my opinion and guesswork.