How could you ever tell?
Yes, yes I'd far prefer that.
Te'o would shore up Faz's defensive ill-discipline. Either would provide Ford with a reassuring get-out-of-jail card, allowing him to do more himself ball-in-hand, and get flatter to the defensive line. Either would provide Ford with a hard-running option that every FH needs as an option to manipulate defences. Either would attract defences onto themselves, buying a little time for both FH and OC. Either allows for Slade at 13 to become a viable option.
Further to that, it would allow Ford to kick for the corners, which he's better at than Farrell, but comes at the cost of a 70% kicker instead of 80%.
For that matter, I'd prefer Farrell at 10 with Tuilagi/Te'o at 12 to the Ford Farrell axis, for the same reasons as above. Compared to the above you'd gain Farrell's never-say-die attitude, and that extra 10% off the tee, but lose Ford's superior handling skills and game-management.
Currently, I'd take 10. Farrell, 12. Te'o > 10. Ford, 12. Te'o > 10. Ford, 12. Farrell.
Give Manu the rest of season getting rid of the rust, and getting some game time at 12, and he probably takes the 12 shirt. If Ford finds form for Leicester, then he gets the 10 shirt.
Give Slade, Devoto or Losowski 20 matches at 12 for their club, and they enter the equation at 12.