FWIW, I think I can still get the copper improved T58 and roaded T59 even with a T55 horse hookup. City 4 gets dumped on a bit with this and doesn't get the second cottage but does have the farm down on T54. The only thing that really gives is the settler time from the capital and some burnt worker turns (2 lost moving to horse, 1 more lost moving a second worker to a forest, 1 excess worker turn lost moving chopping worker at city 3 over to the copper (we always lost one worker turn whatever we did, now we lose a second).
This involves stealing the grass mine from city 2, but I think we still have the hammers to keep with settler whip to T56.
This involves stealing the grass mine from city 2, but I think we still have the hammers to keep with settler whip to T56.