"An assist?"
There was no Picard. Riker planned and directed the kidnapping of Locutus, directs Crusher and Data to access and retrieve information from Locutus about the Borg's vulnerabilities, then orders him to plant a directive in the Borg group consciousness using Locutus as the conduit. As Data attempts to do so, Locutus finally utters one word, "Sleep," which Data correctly intuits to be a suggestion of the command that should be implanted.
You can call that "an assist from Picard" in order to diminish what Riker and his crew accomplished if you like, but as I already said, you're dancing around what happened in an attempt to make Jellico look like something other than an insecure idiot.
Not Ronnie Cox's fault, but the writers. Trek often ignores the ongoing context of its stories in order to have something happen and people behave in some unlikely way for a single episode, and then just as quickly forgets that one, too.