Bitcoin probably has more developers than any one altcoin. However, there are probably more altcoin developers than there are Bitcoin developers. There are literally thousands of altcoins, and each one needs a developer. Some (many) share the same developers, but there are still probably a lot more than Bitcoin.
nah. lets say out of 2000 alts.. 1500 are copy and paste jobs using a web service to do the coding for script kiddies to then throw around for pump and dumps..
i think there are less then 200 people coding alts, and they make multiple alts over the years.
as for bitcoin.. some of these altcoiners are also bitcoiners. and just concentrating on bitcoin there are many programmers. not just bitcoin-core, but multibit, electrum keepsafe, trezor, mining rig companies, payment gateways/exchanges. hobbiests, mobile wallet service providers. the list is endless.
but when we look at the alt community. its mostly script kiddies copying scripts and rebranding.. nothing really innovative nothing that has real world useage/corporation use.