It should be clear that the numbers above refer not to the total number of witnesses reporting the "streak" in question but the number who reported the streak and who reported its origin and who had a clear view of that origin. Obviously such a group will be a small portion of all people who heard or saw anything related to the crash.
And actually, I read most of the 755 witness accounts.
Then you should know that most of the accounts are of people who heard multiple bangs or who turned to look after things were already falling. You make it sound like all 755 people were looking in the same area all the time but only 25% saw the mysterious streak. That's as misleading as someone on the other extreme saying almost all 755 witnesses saw a missile.
I'll buy that. Let me try another approach. On final analysis the NTSB there were 258 streak of light witnesses, yet only 38 describe the streak as moving vertically or nearly so. This is from pg 232 of the NTSB final report. Certainly each of these witnesses saw the streak, but less than 20% reported it moved vertically. Who are we supposed to believe?