Ok, got a copy of the Morgan book (a lot of info in a small package...I already had the Coleman Hawkins book in the same series and found the same there), and here's the rest of the story, which is pretty interesting and is a bit counter to the "conventional narrative):
In January, 1951, De Franco quit the sextet to form his own group and was replaced by Rudy Rutherford. Then, in April, Basie had an opportunity of getting a big band of 16 men together for a one-week engagement at the Apollo Theater. He lost no time in getting his new band into the Columbia studios to wax his first big band sides since August, 1949, including a splendid version of 'Little Pony'. Neal Hefti, who wrote arrangements for the sextet with Buddy De Franco, also contributed charts for the session that included heavyweights such as Al Porcino (tp) and Marshall Royal (as). But there were no other big band gigs in the offing,and Count was forced to return to a small band again. In fact, this became the pattern for the year: a week at Birdland in April with a septet containing suest trumpeter Buck Clayton, then a big band booking at the Strand Theater the next month.
Basie took a big band to the Oasis Theater in Los Angeles for two weeks in August then turned up in Chicago's Capitol Lounge in September with a septet. But in October he put together a big band for a week at the Savoy Ballroom and managed to weather the storm for never again did he have to reduce the size of his orchestra. The October 1951 band contained Gus Johnson, Freddie Green, and Jimmy Lewis from the sextet plus a trumpet section containing boppers Tommy Turrentine and Idrees Sulieman. The Lester Young doppelganger Paul Quinichettte took most of the tenor solos and, in a good humored subterfuge by Clark Terry in his recommendation to Basie, Ernie Wilkins came into the band as an alto saxophonist (unknown to Basie at the time, Ernie had never plaid alto in his life....
Etc.
So it looks like the New Testament band was conceived in 1951, and birthed later that year. It was not in any way certain that it would survive, but 1952 and the contract with Granz made sure that it did.
that April 1951 session is an interesting one, in that two tunes made it out right away (and I think "Little Pony" must have been some kind of a hit?), but the other two seem to have not made it out until the LP/45 era, on Epic.
Little Pony/Beaver Junction:
+
Nails/Howzit:
It was a grand session! But I don't think that Hefti alone did the charts...not with Buster Harding's name on there. But who knows?
"Beaver Junction" actually goes back to a 1944 V-Disc!
Is it just me, or does that sorta sound like an early Tadd Dameron arrangement?
If not Tadd, Budd Johnson, maybe? Definitely one of those Eckstine arrangers.