As an update to this, my brother did his deep yDNA (through another service) and came back as Haplo I 1 M253, and in reading through all the material, this group displays a very clear frequency gradient, with a peak of approximately 40 percent among the populations of western Finland.

As taken from the Wiki on the specifics of M253: (which returns to my original thoughts of how the F/V-U showing up could be the orgins of what Scanda was to become)
I1-M253

Haplogroup I-M253 (M253, M307, P30, P40) displays a very clear frequency gradient, with a peak frequency of approximately 35% among the populations of southern Norway, southwestern Sweden, and Denmark, and rapidly decreasing frequencies toward the edges of the historically Germanic-influenced world. A notable exception is Finland, where frequency in West Finns is up to 40%, and in certain provinces like Satakunta more than 50%.

Outside Fennoscandia, distribution of Haplogroup I-M253 is closely correlated with that of Haplogroup I-M436; but among Scandinavians (including both Germanic and Uralic peoples of the region) nearly all the Haplogroup I Y-chromosomes are I-M253. Another characteristic of the Scandinavian I-M253 Y-chromosomes is their rather low haplotype diversity (STR diversity): a greater variety of Haplogroup I-M253 Y-chromosomes has been found among the French and Italians, despite the much lower overall frequency of Haplogroup I-M253 among the modern French and Italian populations.