On (not) being misleading
But its a bit misleading when outsiders are looking at "Who youll work with" if those same people's links are simply to what I would call more of a resume looking for potential other jobs.
What's misleading about that? If I look at your job posting and it says the people I'll be working with are all people actively looking to work elsewhere, that's very informative about your company and not remotely misleading for me.
That said, I don't know what you'd call "more of a resume looking for potential other jobs." I hope you don't mean just having a SO Careers page in general.
I am quite content in my current job and expect to remain with my employer for quite a while, but I'll still keep a well-maintained LinkedIn profile - and I need to get my SO Careers profile up to date, I've just noticed. That's a matter of establishing and maintaining my professional identity and personal brand, though, and not a matter of me looking for a new job.
On the importance of seeing the potential coworkers' Career pages
This being their professional profile, it details their expertise, experience, position in the company, and so on. As a potential employee at your company, that's the kind of thing I'd want to see: their professional identity, and their identity within your company.
Their profile on Stack Overflow won't tell me many of those things, though their activity might tell me a little. It's not a high priority, and if your employees feel like their Stack Overflow profile is worth showing off, they have the opportunity to link to their account in their profile.
I would prefer the Who you will work with section to link to Careers profiles.
Especially because for any other network site profile they'd rather show off, that can be linked to in their professional profile.