This is such a common dynamic! Leo is a fixed fire sign that processes out loud - you think by talking. Capricorn is a cardinal earth sign that processes internally and prefers to present a finished thought rather than a work in progress.

Neither style is wrong, they're just built differently. The fix that usually works: give your Capricorn coworker a heads up that you're 'thinking out loud, not asking for a decision yet.' That framing takes the pressure off them to respond immediately.

And if you want more from them, try asking a direct question instead of an open one - Capricorn responds well to 'what do you think of X' rather than 'let's brainstorm.'

omg the 'goes quiet and comes back three days later with a full plan' is SO accurate lol. my capricorn dad does this exact thing