I do not think either of these directly answers your question, but here are two interesting stats for Pletcher. I found his Kee stats since 2010 and contrasted that with his overall Breeder’s Cup record.
At Kee since 2010: 248-67-37-24 (27% win, 52% in the money)
At the Breeder’s Cup: 108-7-12-13 (6% win, 30% in the money)
His Kee stats are for all horses, not just shippers. While Pletcher does not normally scream turf to me, 3 of his 7 wins were on that surface at the Breeder’s Cup ((Ashado (D, 2004), Speightstown (S, 2004), English Channel (T, 2007), More Than Real (JFT, 2010), Pluck (JT, 2010), Uncle Mo (J, 2010), Shanghai Bobby (J, 2012)). Also of interest to me is that he won 5 of his 7 races in just two years. In 2004 the venue was Lone Star and in 2010 it was at Churchill Downs.