Biggest IPL player trade & Atkinson left out?

Australia will field one of the oldest Test match teams ever in Perth but is that actually a strength rather than a weakness? England might have to drop one of their main fast bowlers - could it even be Gus Atkinson? Meanwhile Jadeja and Curran going to Rajasthan and Samson moving to CSK is the biggest player trade in IPL history - does this potentially mean that we have seen the last of MS Dhoni and will we see more