People keep insisting that Massa may cause problems for Alonso because we only have a singular sample (single season) of Alonso having a competative teammate in his career, this is all we have to go by.
Now by 'competative teammate' of course that is a relative statement, Lewis, still a wet behind the ears rookie at that point was too competative for Alonso, so i dont think it is stretching credulity to consider a seasoned professional like Massa, who knows how to win races and who has competed in a title race to cause Alonso concern.
Given that, as can been seen in the official FIA documentation of the time, Alonso's reaction to the idea of equal status was to go off the deep end, all in all i think this perception people have gained shows merit.
As for Hamilton not wanting Kimi, i'm sure its true for all drivers that the less competative their teammate, the happier the driver will be, just as both Hamilton and Alonso were both respectively happier when they parted ways, then both in a position of having entirely uncompetative teammates.
It all depends whether you rate Kimi more highly than you do Alonso. When looking at this from the perspective of results, we can see the Lewis handled himself very well in beating a 2x WDC (or equalling if one wishes to ignore track-back). People can bang on about team biases all they like, but you just have to look at the likes of kovy, piquet, grosjean, fisi, luca to know that a driver has to have talent to give the team something to work with in the first place - in any event, again going by a single sample, one would conclude that Lewis knows what to expect.
If however Alonso is considered much the superior to Kimi, then one would assume this wont be a challenge for Lewis.