Welcome to the RACER Mailbag. Questions for any of RACER’s writers can be sent to [email protected]. Due to the high volume of questions received, we can’t guarantee that every letter will be published, but we’ll answer as many as we can. Published questions may be edited for length and clarity. Questions received after 3pm ET each Monday will appear the following week. Q: Coyne needs to sign Sage to a one race deal to be David’s muscle. Shawn, MD MARSHALL PRUETT: McLaughlin’s twice his size, so you might be onto something here. In a throwback to the 2000s, I feel…