I beg to differ.

Tom Cruise is not, and will never BE Jack Reacher.

Whilst I can't argue, through lack of knowledge, with the statement that...
"....... 'The fact is that there are no actors who are 6'5" giants out there so he was never going to be played by an actor that size.'...."
I cannot believe there's nobody taller than a dwarf for the roll, even I'm  taller than that, JUST.
The same page quoted an item which said
"....one recent poster on the social media site compared the choice for the eponymous title role to casting Ronnie Corbett, the diminutive bespectacled comedian, as James Bond....."

Reacher 6'5" 220-250lb = 15-18st = 90-115kg
Cruise    5'7" 170lb          = 12.25st =  77kg

NO contest.