Thuidareiks said:
how remarkably familiar the reconstructed Gallic looks to someone with a knowledge of early Germanic and a smattering of Latin. You can really see how easy it would have been for these "Celts" to communicate with their "Germanic" cousins
Are we seeing a stage where proto-IndoEuropean had not diverged beyong mutual comprehensibility? Or are we seeing a partial re-convergence between geographically close regions? Or (thirdly) just cross contamination in reconstructed languages?