This was reported in the BEA interim report in Jan 2001.
The feeling is that the missing part would cause the gear to skew, possibly by up to 3 degrees. this was cause excessive tyre wear over time and additional tyre heating but not a burst. It would hve been spoted aily soon when they investigated the excessive tyre wear
The running over the bit of titanium would slash and destroy any tyre.
Summary:
Discounted as not cause of accident, and not even slightly contributary. (Although I will stand corrected if thing change!!)
Gordon