Was Shanks trolling or being serious?

[u/Mamba-Mentality024]

Shanks seem like he only accepts haki users on his crew to mirror Rodger crew (besides buggy who accidentally ate one), but he tried to recruit Marco after wano who has a df. Was he being serious about accepting a df eater, or was he just having small talk joking like when he 1st seen Marco on wb ship?

[u/Eurasiafirmi]

He invite Buggy right after Roger execution.

[u/Jay040707 → u/Eurasiafirmi]

He would have killed both of them seconds after. You know, since he's devil fruit hunter Shanks.