A Singing Americans Question

The album pictured to the right was the first Singing Americans album after Mike English and Rick Strickland left the group and were replaced by Clayton Inman and Phil Barker, respectively.  However, when listening to “God Is Greater” from this album, the tenor sounds very much like Strickland, with the exception of the solo tenor line “God is higher” which is obviously Barker.  I know Clayton Inman and Strickland were in the group together for a while, as they are the members in the concept video for “Welcome to Heaven” which is available on youtube.  (Volscot, a commenter here occasionally, has the video, maybe he can provide the link for us!)  Is this another case of a personnel change in the midst of recording an album and leaving some of the previous member’s vocals intact, or is it Barker all the way through the song, and he just happens to sound a lot like Strickland on this cut?