Jarvis was talking (at the time) out of emotions which is not the best way to do it when you are in his position.
In reality, there was a struggle between his Japanese bosses and the Marketing Division, when Rossi left he bruised a few egos, when Lorenzo spoke with Honda back in 2012 he did the same, so it's not as checkered-simple as that, loosing the title to a rookie in 2013 made sure Yamaha RAcing division took their own interest at heart, Rossi is part of their development plan.
Back then, the Marketing Division couldn't have prevailed without a few factors such as Rossi "outstanding machine development sense" global.yamaha-motor.com/race/wgp-50th/column/vol30/ and his availability, renewed threat from Honda after the 2011 deroute and 2012 close call, Pedrosa won one more GP and Stoner could have won again had he not been injured, he scored 1 DNF and 3 DNS and 1 victory less than Lorenzo.
This sort of dat Yamaha racing are interested in, just like they noticed Marquez record first season and speed in 2013.
As a matter of fact, what people tend to overlook are the partial times which consistantly showed Yamaha technicians that the M1 development was going the wrong way since 2011.
In 2011 Lorenzo used 2010 M1 parts up to Le Mans after testing new parts in Estoril in May, in particulr a new swing arm which made the 2011 better in the corner (corner speed) but made it slower in all other aspects, in 2013, they tried to make of the 2013 a similar chassis to the 2010.
For 2014 they changed the bike so that it assessed Rossi demands on points he made when he came back; braking, turning-in and acceleration, this happened thanks to him, not anyone else.