If David Henesy wanted to leave DS, they should have had a recast for David Collins prior to the start of 1840 and then use the new actor as Tad during 1840. That way, the original plan could have been used. The new actor would have been more accepted as Tad since DH would never have played the part. Having him play David Collins for the last week or so of the Summer of 1970 would have allowed for the David-Tad connection to carry over to 1840.
