By Rob Lenihan Volkswagen’s top executive admits being caught flatfooted by Tesla, but still wants to be the top EV seller. The tide is high, but Herbert Diess is holding on. The Volkswagen (VWAGY) – Get Volkswagen AG Report CEO admitted that arch-rival Tesla (TSLA) – Get Tesla Inc Report came on stronger than expected, but he still believes that the maker of the iconic Beetle can pull ahead of Elon Musk & Co. and become the world’s largest seller of electric vehicles by 2025…maybe. ‘We Won’t Give Up'”We didn’t expect our main US competitor to be so fast and well-prepared,” Diess said, at th…