>>150065712
Johnny was actually the first to get his own solo comic feature. Stan Lee clearly thought he would be the breakout character, being a teen superhero with the code name of another hero and cool looking powers.

Eventually the Thing was added to the feature as a co-star because Johnny couldn’t carry it on his own and it was Ben who had clearly emerged as the most popular FF member, thanks to his combination of strength, snarky sarcasm, pathos/self-pity and the best superhero catchphrase in years. The other three were much more conventional characters.