I'm onto my F2 stage of grow out and have 10 clumps of walking onions nearly at the point of producing scapes. In the photos below is one of two F2 plants from a year ago, it produced good sized bulbs identical to the parent clone and having no other onions flowering that summer i was only hand pollinated over itself
young seedling
Same plant but older
What the F2 plant produced
These are the size of the parent clones that i started with