Brown's TD put Bama up
14-12. Both teams subsequently scored again, but Bama never relinguished the lead.
I am always on guard for "presentism," the belief that what applies today is what has always applied. It was not fore-ordained from the beginning of time that Bama would be one of those schools that won national championships. Until Brown helped Bama take that lead first ever lead in its first ever national championship game, it had never happened, so Brown's catch is pretty darned important.
In 1926, Alabama had never won a national championship. How many subsequent players came to Alabama because they believed Bama could win another one? 1926, 1930, 1934, etc.
None of that is to say that Tua's walk-off TD pass is unimportant or was not spectacular, just that today's Bama program stands on the shoulders of giants.