There's no need to wonder if Hamilton and Alonso would be faster than Raikkonen in the same car when Massa was in the past and Grosjean is currently - it's just logical common sense.
The amount of fastest laps is simply an indication that he finishes more races. You aren't going to get fastest laps unless you finish races, which he does more than anyone else. Prost had more than double the amount of fastest laps than Senna - would you say he was faster?
Find me any publication outside of Finland that claims Raikkonen is on the same level as Alonso is - I have serious doubts that any exist.
I'll need to take a google in my hand, there's no doubt a lot outside spanish media. (at this particular moment or over history btw?)
There's a lot of need to wonder, Massa hasn't been anywhere near his level after the accident so comparison is invalid, Grosjean was completely fresh when he joined midseason - and just to so you realize how much that can affect, check the season Massa got into his accident - Fisichella didn't finish any higher than he did in his Force India after being thrown into unfamiliar car.
And you should really read what happened behind the curtains at Ferrari during Kimis time there to understand even half of the speed he seemed to be missing on couple seasons.
Let's take a look at those fastest laps
2005, Kimi gets 10 fastest laps of the season, didn't check how many Alonso got but under 6 anyway, since 7 would have gotten him on the top10 list.
Alonso finished 2 more races than Kimi did that season
2008, Kimi gets 10 fastest laps of the season, didn't check how many Alonso or Hamilton got, but under 6 anyway, since 7 would have gotten them on the top10 list.
Alonso finished 2 more races than Kimi did that season
Hamilton finished 4 more races than Kimi did that season
Neither should be possible according to you, since Kimi isn't fast, only reliable
edit:
Let's add more statistics, I couldn't find the amount of actual races finished, but I did find total laps driven by each
Alonso:
Total laps: 10798
Fastest laps: 19
Räikkönen:
Total laps: 9008
Fastest laps: 37
Hamilton:
Total laps: 5936
Fastest laps: 10
Alonso having finished over 1500 more laps, I'd say it's safe to say he has also finished more races