I don’t know about that, I despise Trump, but I think he is making Jeb look weak, rather than reasonable.
I think Trump is in it strictly for his ego or to help his old pal Hillary.
That is also possible, but remember that Jeb stated early on that his strategy did not include winning majorities in the primary. This all fits.
Maybe Jebbie and Trump are trying to out-do each other to boost HRC!