I1 is of Germanic origin and N1c is of Finnic origin, many people resist the idea as long as they can come up with different theories to denounce it.
Baltic Finnic and Germanic where born in close contact of each other and these two paternal haplos confirm the dating.
Finland specific I1 is moving during the iron age with the other Finnic haplos and language so it was assimilated early by the Finnic expansion in to the Baltic region.
We do need more samples from Estonian I1.
However, evidence emerged (Szécsényi-Nagy et al. 2014) from the testing of Early Neolithic Y-DNA from western Hungary that haplogroup I1 was in fact present in central Europe at the time of the Neolithic expansion. A single I1 sample was identified alongside a G2a2b sample, both from the early Linear Pottery (LBK) culture, which would later diffuse the new agricultural lifestyle to most of Poland, Germany and the Low Countries.
http://www.eupedia.com/europe/Haplogroup_I1_Y-DNA.shtml
There was nothing germanic at the time.