Star Trek - 2.06 Doomsday Machine

Why in the world would Kirk stay behind on the damaged ship to prepare it for being towed? Wouldn't an extra engineer make more sense, especially with Scotty present on the damaged ship if command decisions needed to be made? After that little logic dilemma this is an enjoyable Classic Trek episode despite the Doomsday Machine looking like a deformed, space-faring log even with the special effects upgrade. I love Spock's line: "Vulcan's never bluff." Yet another transporter malfunction - given the transporter's unreliability why would anyone rely on it?