Thanks for providing such a descriptive backdrop. When you're cleared to return to running it will be essential to do everything you can to NOT tweak it again. You don't want this to become a recurring injury.
The Asics GTs are a quality support shoe, so we can rule out shoddy footwear as a factor. I suspect that your calves have become mighty tight through your marathon buildup (probably hammies and lower back also). When that happens your PF suffers for it.
So... become more flexible in those areas and you'll take an unfair load off the plantar fascia. (BTW, no MD ever told me this key piece of information.) Without understanding this point, I fear you'll re- injure that arch within a year. And that would be a pity. So wall push-ups (for calves) should be done regularly in addition to a hamstring stretch:
You should also become familiar with how to tape the arch. Until it's fully healed (and often that can be a 6-mo. process), this will be an important safeguard for long runs. A very descriptive video can be found here:
Summary: As you return to running just remember to be proactive about elongating your hamstrings, calves, and lower back. If you do, your plantar fascia will thank you for it. :-) Good luck!
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