Speaking of lightsaber building, is there some sort of rule that you’re only allowed to wield a lightsaber of your own making?
Obi-Wan went on to build his own lightsaber after losing his first one in Naboo despite having Qui-Gon’s. AotC established that the Jedi Order does have spare lightsabers, yet Anakin and Obi-Wan built their own lightasbers after the Battle of Geonosis instead of keeping the ones they were handed. This unspoken rule IMO contradicts Obi-Wan’s line to Luke about his father wanting him to have it when he was old enough.
I’d say it’s traditional for a Jedi to build their own lightsaber as there’s an arc in The Clone Wars of the younglings going to Ilum to gather kyber Crystals to build their own lightsabers for the first time. They probably had spares because the two Jedi wielded two lightsabers as in the background of the battle you can see a Jedi battling with two. Just like Ahsoka.
I’d also say there’s no contradiction in what Obi-Wan said if you watch things in sequence order. Obi-Wan also fibbed a couple of times from his certain point of view to get Luke to go after his destiny and to become a Jedi. It’s only when Luke lost his aunt and uncle that he decided to follow along.