Plan, Contigency. The time to sign Bonds, get him up to speed, and on the roster before Sept 1 (thus making him eligible for the playoff roster - assuming no 60-day DL stint for Ortiz) is now. There's just enough time to get him ready. If they don't, and one week from now Ortiz is done for the season, well, so is the season, pretty much. Bonds would be one hell of a contigency plan.
If Ortiz doesn't get hurt, he can play LF, move Bay to RF, have Drew play CF. Not the ideal defensive OF, but it'll create a few runs.