Or, what if every of those bacteries whose evolution stopped thousands of years ago are simply completely inapt to compete with the ones we've got today, because those had much more time to evolve ?
Something like maybe a Rodesian Ridgeback (lion hunting dogs) might stand a good chance however.
First time I've been scared of a dog since I was three. When a pit gets mad at you, you can kind of convince yourself you can keep it down by kicking and pushing it. Your neck is out of its immediate range unless you fall down. The Rodey was big and heavy enough that I would have had basically zero time to react if he jumped up. Humans are just so squishy. If you can throw a good punch, you can knock out 99% of people with one good hit to the chin. A strong hit to the liver will incapacitate anyone and kill them without treatment. Unlucky hits to the face can kill people as well.
I was very acutely aware that no matter how hard I hit that dog, I wouldn't be able to knock it out and my only option was basically to let it chew on me while I tried to hurt it as much as possible. Just keep punching anything that looks soft until it decided I wasn't worth biting, and do my best to keep it away from my neck and nuts.
Those are huge dogs and aren't afraid to scrap. I'd still happily take on one of them for my life given the choice vs a velociraptor :)
They'll bluster and charge to defend young against a curious city dog, but will flee up to roost if challenged by a pack of hunting dogs. If you find a cornered turkey, don't try to catch it or let your dog attack: you'll probably win from sheer mass and from having predatory weapons, but you will be badly bloodied.
The idea that more recent species are "more evolved" than ancient ones is not completely absurd.
I do wonder how many Cretaceous critters were intelligent to the degree of ravens or dogs or primates, if any. We know they weren't as good at terraforming as we are, or there'd be some evidence in the strata. But the Cretaceous was longer than the current period, so I wouldn't be shocked if something we could call intelligent evolved.
Mutation takes place very quickly once the revived microorganism makes contact with the outside world. I would think the outcome is highly unpredictable.