
There is no evidence of any invasion by Rs into I territories in europe following the Last Global Maximum.
Is and Rs in north-western europe have been admixed for many thousands of years. The germanic languages have not been around nearly that long. Similarly, the celtic areas were also admixed thousands of years prior to celtic languages developing. These respective cultures are really not very old compared to the haplogroups under discussion here.
I should further note that haplogroup I is believed to have entered europe around 20-25,000 years ago. This does not make I old enough to have formed part of the initial cro-magnon population.
John
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