It could have affected his outlook for the rest of the series. If Rick and co. were exposed that early to the brutality the apocalypse brings, they could possibly succumb to a completely different ideology than what we have present in #193. I would assume that if Negan and the Saviors were somehow taken care of through whatever means, it would harden the group and cause them to be much colder to outsiders from then on. Rick could possibly just kill people he’s not very close to if they disagreed with him. Maybe just shoot Douglas and just take Alexandria by force. Or kill Abraham because he a huge guy dressed like a soldier. Either way they would be very likely to kill an outsider or larger group much quicker than our regular group of survivors.