That's not the right reason.
The Altcoin on the top 500 Coinmarketcap I've been refering to most, all the mined coins, born before 2015, max supply, have increased 10 times or more from 12/2016 to now, have coins increase 100 times, 1000 times. Since 12/2016 far too much good news for Cryptocurrencies. Every day in the world again appeared more and more open accounts, cash flow and virtual money as much. Price all coin will never stomp on the spot.
As for the disagreement, leaving the team, it happened at the BTC -> BCH, ETH -> ETC, Zcash -> ZCL ...,
SPR is no exception.