I-485 Approved after AC21 & RFE

I have a pending AOS (I-485) application
filed by my previous employer (company A). The I-140 is approved and is well
past 180 days. I moved from company A to company B in late April
2008. They did an H1 transfer and filed for AOS portability under
AC21. I did not like the role there, so had planned a move to Company C, my current employer - again H1 transfer and AC21 (yet to
be filed). Just before I moved, I got another offer from company D
(which I believe best fits my long term career interests). I would've
avoided the hop to company C had I not given the notice to leave at
Company B. Now, I am looking to move to company D at the earliest (perhaps in a month). I have
been at company C for 4 weeks now.

Should company C file an AC21? Since there is already an AC21 on file (by
company B) and if I will move to company D, can I reduce one additional AC21
filing? This is just so that there aren't 3 Ac21s filed and to avoid
making me look frivolous. Please advice. If its safer to file it, I
can request an AC21 filing soon from company C.
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