Re: goalies, here's my 2c:
1.
The reality is that neither VV nor IS have built up anywhere near enough reputation/trust to secure the position in any meaningful way over the other guy. Who will start playoffs is a coin toss depending on how the remaining games will go. But even after that, IMO the leash can't really be any longer than ~2 bad/subpar games (if that) -- you don't know if the young guy will recover mentally under playoff pressure, so at least go to the rested and mentally fresh guy (of very similar ability).
2.
Since Samsonov came back into the rotation on Feb 28, numbers show (assuming I did them correctly) that whenever the Caps coaches switched from one goalie to the other (e.g. after a bad game), they got a cumulative SV% of 0.920 in that first game after the switch (542 of 589 shots saved in 21 such games). Compare this to their overall SV% of 0.913 during the same time period. (Note: I excluded the weird Apr 1 Samsonov "concussion" game, with which the numbers change to .913 and .907 respectively, so ofc lower percentages but same overall story).
This suggests that as a tandem, VV and IS have been pretty good at responding after switches -- in fact clearly better, it seems, than they have been at staying sharp. Also, the Caps' coaches have been pretty good at making these decisions. So why should the Caps worry about using these same quick-yank tactics in playoffs, if it has worked pretty well so far? If anything, one might be tempted to ask the question of whether the Caps could be better off changing these goalies even after good games!