Inasmuch as the only other Craig Tennis credits I know of are on the 1966 graphic novels Christopher Lee's Treasury of Terror (Pyramid) and Dracula (Ballantine), I figured "Senoj" in the first signature and in the "ones" part of the second is the packager of the two books, writer-artist Russ Jones. The third signature here is from DC's Mystery in Space 108 (June/66).
I can't see Jones' pencils in these Go-Go stories, so I'd credit him here as a inker. I was going to say co-writer--I would have thought the art on these two stories is completely Henry Scarpelli, the "Scar" part of the second signature although left out of the first. But then I asked myself how the writer would get hold of the art to sign it.
Of the four Scarpelli stories in #1 and 2, there seems to be someone else's pencilling in places at least on the Rotting Stumps story in #1--most notably the faces of the girls in the crowd scenes.
I'm not seeing D. J. Arneson's writing on these early issues. Note that #2's Miss Bikini Luv story is in the past tense, which is not the case in Arneson's stories as "Norm DiPluhm" in the later issues.
New attributions on Charlton's Go-Go #1-2
(underlined = signed)
|June/66||1||The Rotting Stumps||p: Henry Scarpelli, and another?|
|Miss Bikini Luv||w: ? (not D. J. Arneson)|
|Return to Peculiar Place||w: ? (not Arneson)|
|Aug/||2||The Rotting Stumps||w: Craig Tennis|
|p: Scarpelli i: Russ Jones|
|Miss Bikini Luv||w: ? (not Arneson)|
|Return to Peculiar Place||w: Tennis|
|p: Scarpelli i: Jones|