a_wizard_did_it
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Either they fully merged at 10 and they stop aging individually or Red Jon didn't have to mature/matured slowly due to Old Jon
I think it was because of Jon's battle cry they broke formation and dispersed leading to the firemanes to take them out in much smaller groups
Wulfur is there partially as Jon's sworn brother and as Bjorna's future partner
Honestly after rereading Old Jon not being able to do the fire shout, something that he is probably the best user of we see (at least from when i stop reading at 700) and him being the dragonborn's father should be able to use the flame breath shout,
aMEN x9
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