Selecting Which Fruit to Save Seeds From

[Solanum315]

Probably a stupid question but liberal arts major here.....

In the process of stabilization of a particular line, and also assuming that there is no cross polliniazation, does it matter what particular fruit you save seeds from on one particular plant?

Case in point, I got an accidental cross with Black From Tula and a small commercial Roma from the Philippines that was one of many called "Native". I am growing out F2 now and there are a number of saladette sized tomatoes with some interesting variations in color but my main objective is to stabilize a beefsteak or two. Out of 8 plants, one of them came up beefsteak. On that one beefsteak plant, I selected the largest fruit to save seed from.

The heart of my question: would 20 seeds from this fruit necessarily be any more likely to produce large fruit in the next generation than 20 seeds from, say, the smallest fruit on the same plant? I kinda suspect not but would appreciate a more science-y answer.

I recognize also that the catfaced fruit is sometimes indicative of a megabloom which some believe are more likely to be crossed due to a more pollen receptive pistil shape....