Lance is a Five Eighth / 2nd Five Eighth. I hope they don't do what the Reds did and waste him at Fullback.. although he did fill the roll admirably defending at 10 and attacking at 15. For me it's pretty clear what the back line should look like with the current roster:
9. Matthewson
10. Lance
11. Morohan
12. Godwin
13. Taps
14. Junior
15. DHP
The 3 of Godwin, Taps and Junior can all fill that physical crash ball between them pretty well. DHP and Morahan are both decent sized outside backs who can win contact. That physicality shouldn't be an issue. I think the only thing really missing is another FAST outside back. The rest looks pretty good with Prior, Grant and Burton on the bench.
Unfortunately with the Force having the 2nd most special coach in super rugby, behind the Reds, You'll probably continue to see the 10 man rugby with the kicking Five Eighth deployed.