Who? Micocek and Jack Hayes? We aren't going to pull a 200+ cm key forward who can ruck for pick 29.
Last year Gold Coast got Mabior Chol as a FA and Levi Casboult in the rookie draft. Year before Melbourne got Ben Brown for pick 33 and a 2 spot upgrade of a second, Essendon got Peter Wright for a future fourth, year before that Dogs got Bruce for 32 and 51, etc, etc.
Presumably Jackson will replace all of his ruck work, probably at a better standard too, and half of his goal output. I'm tipping you could readily find 18 goals somewhere.
Reckon Freo supporter are losing their minds a bit with this idea of how irreplaceable Lobb is, particularly with Jackson coming in.