If it will be 2015, and it was known in advance, then why design a business plan and schedule that you can't deliver without outside help; which may or may not have been forth-coming. Could be risky. If 2016 is the next -800 date then do RYR plan this lease operation for the next 2 years?
Believe Sept is start of first deliveries, that may or may not change by month or so depending on how Boeing can ramp up production.
Boeing 737-800 Production List - Planespotters.net Just Aviation
When order made we discussed it on here (you in that one as well
) as I had suggested that Summer 2014 was always likely to be an issue with number of airframes available and possibility of need to lease some in.
Think your point regarding crews if Wet leasing is valid. I would suggest that its likely to be on a fixed number of high frequency routes due to both engineering support and pilot location...........the list is 5-6 locations.
Funny feeling that Interiors on new 738s may be different............don't know just a gut feeling that FR will pull another rabbit out of a hat.