I've got no qualms moving on from Lourdes. Good but not a great stick that was averagish defensively overall but limited to LF.
With that said, I don't like moving on from him if we're replacing him with a Whit/Biggio platoon. Whit is probably a meh or worse defensive OF that doesn't hit lefties particularly well (~95ish wRC+ over the last 2 years combined). Cavan is a bit of an abortion defensively in the OF, and is maybe league average against righties. That would make 3 of your 5 regular OF's completely abysmal against lefties (Varsho, Biggio, & KK are all brutal brutal against lefties), and a 4th that is below average against them (whit).