In a Draft like this? It should be 1 vs 2, 3 vs 4, etc... Because that's "fairest"...
Why make the person who drafted last play the person who drafted first? Theoretically the first person has the best cardpool... It doesn't really matter for this anyways, since it isn't swiss it's round robin... eventually you will play Melkor...
It's just one method of pairing people...
1 vs 2, then 3, then 4, then 5...
2 vs 1, then 4, then 5, then 6...
3 vs 4, then 5, then 6, then 7...
4 vs 3, then 6, then 7, then 8...
5 vs 6, then 7, then 8, then 1...
6 vs 5, then 8, then 1, then 2...
7 vs 8, then 1, then 2, then 3...
8 vs 7, then 2, then 3, then 4...
Eventually everyone plays everyone - and it's easy to determine who plays who... you could randomize the players (make a new 1-8)