when I saw him at Rebellion a couple of years ago he was advertised as Ritchie Ramone and did almost exclusively Ramones tracks maybe that was because he was playing Rebellion can't speak for any other gigs,, he did have a good 'Johnny Ramone' on guitar,
It you are talking about Somebody put something in my drink, a minor hit, he was credited with writing it, on my vinyl version at least, according to Wikipedia it was the digital sales where the dispute was, not sure on the details but the court found, reluctantly in favour of the rest of the Ramones.
But yes, he was the only Ramones drummer to sing and write songs for the band.
I think CJ has his own Ramones band