After watching EP4, for me, Ricciardos switch to Renault, in the end was nothing but a payback from Abiteboul to Horner. They lost the Engine deal, Abiteboul was pissed and so he lured Ricciardo in with a big 26,5 million pound paycheck. Seems like this worked out well. Poor Ricciardo appears in this light only as a plaything for a personal feud.
The story around Haas is also great. Steiners comments about Grosjean are brutal!

Watch it if you can!
https://www.imdb.com/title/tt8289930/