Expedia Credit Card

i recently noticed the citi premierpass Expedia credit card and believe it can be a good deal for booking flights. i'd appreciate some help in analyzing the value behind booking long distance flights on the card. the concept i have in mind is layering the fat wallet 5% Cash Back on top of the Expedia rewards points on top of the citi Expedia card thankyou points (2x points per $ spent on Expedia + 1 thankyou point per 3 miles flown on flights you buy on Expedia. let's look at 2 examples:

Flight 1: Thu. Jan. 3
New York Nairobi Brussels, Kigali
JFK 5:15pm NBO 11:35pm +1 day 2 Stops
22h 20m
Brussels Airlines 502
Brussels Airlines 463
Brussels Airlines 463

Flight 2: Wed. Jun. 5
Dublin Las Vegas Washington
DUB 11:20am LAS 10:12pm 1 Stop
18h 52m
UNITED 127
UNITED 461
$949

Flight 1: Mon. Feb. 4
Nairobi Mumbai Abu Dhabi
NBO 2:35pm BOM 3:15am +1 day 1 Stop
10h 10m
Etihad Airways 642
Etihad Airways 7600 operated by Jet Airways

Flight 2: Tue. Apr. 9
Delhi London Abu Dhabi
DEL 5:00am LHR 1:15pm 1 Stop
12h 45m
Etihad Airways 211
Etihad Airways 19
$566

these are some pretty long range flights per $ and i believe this is the correct math behind thankyou points: (F(fare)*2)+(M(miles flown)/3). here are those points summarized for the two bookings:

$949 booking:
1. 13521 frequent flyer miles http://www.webflyer.com/travel/mileage_calculator/
2. 6405 thankyou points ($949*2)+(13521/3) = $64.05 in value?
3. 474.5 Expedia rewards points = $9.49 in Expedia coupon value?
4. $47.45 for 5% FatWallet Cash Back
= $120.99 + 13521 Miles = 12.749% "cash" back + miles

$566 booking
1. 8190 frequent flyer miles
2. 3862 thankyou points ($566*2)+(8190/3) = $38.62 in value?
3. 283 Expedia rewards points = $5.66 in Expedia coupon value?
4. $28.30 for 5% FatWallet Cash Back
= $72.58 + 8190 Miles = 12.823% "cash" back + miles

will the programs stack like this? did i price everything correctly? is there any more stacking that could be done? seems like 12.7% back plus miles is massive.

i'd like to add that a major draw seems to be that the cardholder earns 1 thank you point per 3 miles flown on a ticket booked on Expedia with the Expedia card whether they are the name on the ticket or not. so if was to convince my a friend or relative to let me book the flights on their behalf and they just pay a check to me for the balance of $1515, then i receive $193.57 in "cash" value back through the combined 3 bonus programs for making the booking. any frequent flyer miles can be earned and claimed by the person on the ticket.