No, there is no conspiracy. Nem's whole concept is ridiculous. Even its slogan was copied from Nxt. It claims it is a "new economic movement", but they got that concept from my quote about Nxt being "not just another cryptocurrency, but a movement". Nxt is the true "new economic movement".
It claims it is a "no envy movement", but the only reason it exists is for people to try to replicate Nxt's monetary success.
Nem's distribution is highly concentrated. Currently, Nxt is even more distributed than Bitcoin.
Everyone who is "investing in Nem" is wasting their money imo, but people can make their own decision.
I like NXT, I adore the concept and Im looking forward to see all those great ideas materialized. But I dont think you can really back up statement that NEM is highly concentrated, that is just your assumption - fear of competition most probably, it is absolutly understandible. NXT is great technologically but character of original distribution makes it scary for potential investors.
I personally dont fear that someone owns so much NEM that he could crash the market by dumps, therefore I consider it more attractive.
And having more than 1000 unique members on board creates huge driving force. There is atleast 1000 motivated people that would work together to become wealthy, that is enormous power. Do not overlook this potential.
regarding question in topic,
NO I dont think NXTers are seceretly developing NEM, because I see some big stakeholders from NXT community bashing NEM.