Don't call it a comeback....

You've been running consistently for a year without injury but you took four months off last year with a pretty bad stress fracture? Which is it?

Okay, so the stress facture was 2015?

Objectively yes, you could beat your PRs from 6 years ago. However, odds are that you will have to have training and racing conditions at least equal to or significantly better than they were to manage it. Without the same training buddies to motivate you, coaching support, available time to train, facilities/trails/road routes to put in the miles, the odds will be stacked against you.

Physiologically and physically you probably have the ability to do it. But there are so many variable that you have to factor into play to do it. And, sorry to say this, but the better your performances were back then, the harder they'll be to beat. Do you think you were consistently undertraining and underperforming when you got those OTqs, or were you meeting your goals? If the latter, you've got a hard road in front of you. If you've got the genes for a 2:10 and you've always been a slacker then you might get another OTq yet.

Good luck!

Wait--maybe I read this wrong. You said you took two years off but then you also say after six years away from running. And when did you run your PRs? I thought you meant beat your PRs from six years ago after two years off. What did you do in the other four years, that you were away from running but didn't take off running?

So, PRs in 2010?

Little running in 2011-2014. Stress fracture in 2015? Year of running injury free in 2016? Doesn't quite add up.

Sorry, for the confusion. Should have said 6 years away from "serious" running. Yes, PR's were in late 2010. No running from 2011-2013. Minimal (call it 20-30 mpw) end of 2013-2014. Ramped up training in 2015, had stress fracture. That healed by Jan/Feb of 2016. Did a ton of xt, on roadbike and swimming.

I was likely overtraining in 2010, tons of miles and tempos, no track speedwork, (because of the likelihood of injury): mainly fartleks, mile repeats and lots of hill work. Very little days off/rest days

You need a coach -- not someone to write workouts for you as much as someone to talk with, and tell you when you've done enough. The right training partner would work for this.

As for doubts -- you've done it before, so you know how. I suggest that you start with some more immediate goals, like running some decent 10ks and aiming for a race like USATF club XC. If you can run a solid 10k XC, you'll start believing that you have another marathon in you.

If you're an Olympic Trials qualifier, then you are also more qualified to answer your question than 99.99% of the people who post on LRC.

The people who post on LRC, myself included, all think that they know everything about running, but have never, ever performed at your level.

My free advice is this: Give it a try for a few months, you and only you will know if you've got what it takes to return to PR form.

Good luck.