Let's not forget that Gronk didn't break or tear anything. As far as this particular injury goes, being 100% means pain free. That's all. he doesn't have limited range of mobility, plates/screwed inserted, stapled ligaments repaired, etc. etc..... we got super lucky with his injury.
Essentially, with strong enough pain killers, he could play tomorrow. I think both Gronk and the team are just playing smoke and mirrors, and we'll see him back sooner than we anticipate. I wouldn't be shocked to see him practice (limited) this week, questionable for the Eagles, and active for Houston.