<blockquote class="spPostEmbedQuote"><strong>RCA 74 said </strong>
Yes it is relevant, I was requested to work my relief day during a (Monday) holiday work week. Normal (44k) work week 8.8 per day = $990.84. If code 5 was applied for the relief day the weeks wage would be $1042.54. That's a difference of $51.70. </blockquote>
Even for a Regular Carrier to be eligible to be paid a DACA 5, they must have signed the RDWL. If a Regular is required to work their relief day, and they have not signed the RDWL, then they are not eligible for DACA 5.
So, as far as I know, the RDWL is for Regular Carriers only, and if anybody has not signed the RDWL (Regular or RCA), then they are not eligible for a DACA 5.
Also, pertinent to your question is the fact that, any day of the week can be assigned as the relief day for a Vacant Route, it doesn't have to be a Saturday or Monday while it has no Regular Carrier assigned.