El Pionero and MPAT designers Ed Calderon and Seth Brown (RUMBLE EXCLUSIVE)

Ed Calderon (@manifestoradiopodcast on IG) and Seth Brown, a US service member, who are designers of the El Pionero and MPAT respectively, "reviewed" each other's knife designs and engaged in a question-answer session during the 2023 edition of the Blade Show in Atlanta. Listening to their opinions on each other's designs was quite intriguing.