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In Randy Johnson's best season, '05, he never had B-t-B complete games, let alone shutouts. In Maddux's best year (it's close), '95, he 3 times threw B-t-B CG's (actually he had a streak of 4 in a row) but never consecutive shutouts. At the end of May he had consecutive starts, going all the way, where he allowed 5 then 1 hit (a match with Montgomery) , although he allowed 1 ER in both. In '04, Maddux had B-t-B CG's only once and just one was a shutout.
We've seen something fairly rare.