>>1870419
I'm not talking about physical strength. I'm talking about plot. We're certainly not talking about unit strength, since it's a comparison to Alfonse.
Alfonse is a guy who both can't win plot fights 1v1 but also doesn't have plans that work. Having him around is often an active detriment to the plot. He gets multiple people killed, but also never really makes up for it in any way. And because Kiran can never speak, all of these plans come from Alfonse himself.
Chrom is the lead for most of Awakening. He sometimes asks Robin for advice on like the boat and volcano things in Valm, but otherwise it's Chrom leading the plot and the charge. And he both takes Plegia and defeats Walhart. That's two more victories than Alfonse ever had.