If you have consistent gun placement, you weld your face on the stock consistently you can be very consistent. Sloppy gun control rarely makes for good groups. Another thing to consider, a coyotes kill zone is a great deal bigger than the 1/2" group you guys are punching on paper. I suspect that this is a typical "ya but!" type arguement. You know what I'm talking about "I shoot coyotes all day with a gun that shoots 2" groups", "ya but, my rifle shoots 1/2", "ya but, you don't actually need a 1/2" gun", "ya but, my gun is far better that yours", "ya but, I killed 2x the number of coyotes you did last year", ya but, ya but, ya but, ........ Most hunting situations don't need either high magnification nor an AO adjustable scope, I'd also be willing to bet that more animals are missed due to a seriously out of focus AO scope than any parallax error in a non AO scope. Okay OKay I can hear it all right now ya but, ya but, ya but, ya but ....... In the end you will do what you will, its up to you.
This reminds me of an engineer I once knew. One engineer I knew was trying to close a survey loop on a series of manhole covers, no matter how he tried he couldn't get to close within 0.50", he was going nuts, so he went to an old engineer to find out what he was doing wrong. The old engineer took one look and said "So, you are 0.50inch off at the end of a manhole loop ....... Do you think that 0.50inch error will make it difficult to find a 3.0 foot manhole and is it worth the time/money needed to find the error?" THe younger engineer put the problem asside and spent his time on something more important.