Hingis does not need a coach... she understands the game too well to require one.
The biggest issue about her returning is a point you already made... Is she willing to put the work in? If so.... she will get back to the top 10 rather easily.
People forget how consistent Hingis is. If she plays enough tournaments she will get back to top 10 probably halfway through the season, presuming that she returns in Australia... which is probably the best guess.
Woz is top 10 and she isn't even playing 25,395 tournmanets a year like she used to when she was #1...
We have 3 top 10 players that can produce 2nd serves with rather alarming consistency in the MID 60s (I about puked watching Aga hit 66 mph 2nd serves during Stanford).... that even makes Hingis' 2nd serve look decent by comparison.
Not so sure JCTennisFan.
Unless things have become more streamlined than I'm aware of, a tennis coach's job isn't solely limited to simply coaching.
But, if Hingis has enough time to devote to conditioning, practicing, setting up appointments and schedules, and then also perform the majority of duties and responsibilities required of a professional tennis coach, then okay.
I won't debate you on this. We'll just have to agree to disagree.
The ease of reaching the top 10...
You make it sound as if Hingis is still young, and that her body isn't prone to injury.
You and I both know that her age is a major
Not every player is blessed with Kimiko Date-Krumm or Serena's genes.
The body takes much longer to recover, and equally as long to show results.
Also, I'm not completely doubting her ability to reach the Top 10, because she certainly has the skill.
What I questioning is her desire/determination/heart.
But again, we can't know for certain unless she returns to prove to herself (and everyone else) that she can once again reach and maintain
that elite level.