While it's true the evidence is on the whole circumstantial, two identical patterns (double spacing and twin spelling mistakes) (with the potential of a third in the targeted posts in Reputation etc) are pointers to both having the same finger-print.
I guess... but those are prose characteristics with a large breadth of usage. Most shitposters do the whole double-spacing posting style to make it look like their post has more substance to pad it out and it's probable that the likelihood thereof increases inversely with native English proficiency.
OTOH,
Is it possible to say that
savetheFORUM (activity eleven) and
truth or dare activity 42/174 are alts of each-other and/or alts of Thule simply because of their fingerprints being line double spacing, targeted posts in Reputation etc and their similar UID creation dates 20 days apart?
Anything is possible but I highly doubt the two are intertwined. You will see plenty of new accounts appear in Reputation thus the UID remark is of no significant substance. Moreover, 20 days is a fairly long duration (though again, it doesn't really matter).
If you want to do further post analysis (bear in mind it's going to be a very high ratio) then you could probably find more links. In general, though, think about what you accomplish:
It
may warrant a ban. Okay: in this scenario, another account is created and we have wasted our time.
If the account holder is
not of the same cryptographic identity then again we have wasted our time. Worse yet, preemptive stigmatization and false accusations skew the true number of cryptographic identities arguing against any given issue.