In addition: The Tohoku quake 2011 had a 7.2 and a 7.9 foreshock before the 9.0/9.1 main shock. So, indeed 1.1 to 1.2 magnitudes stronger than the strongest foreshock.

The biggest recorded quake, the 1960 Valdivia quake in Chile, had a 7.5 and a 8.3 foreshock before the 9.5 main shock hit.

Now we had a 8.0 and a 7.0 ...