Curious about your criteria for determining your 'Big Four'. Is this for PvP or PvE? If so there are notable absences (Thorn and Ice Breaker respectively). Last Word isn't so hot for PvE either.
I seem to get P&T quite frequently for some reason, mostly from raids. Gjallarhorn seems to drop at raid bosses for me a fair bit too, as well as one from the abyss chest before it got patched. I once got 2 SUROS regimes from one CE play through - one from Ir Yut and one from Crota.
Last Word is the most elusive for me. I've had 2 I believe.
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Simply the exotics I wanted, yet were unable to obtain. Lends credence to the fact that I have 3 Ice Breakers and 2 Thorns. Not necessarily a "measure of quality" Big Four.
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P&T looks so much better than Ice Breaker. The thing looks like some sort of retarded hedge trimmer. Last Word has epic written all over it, and Gjallarhorn is just Gjallarhorn. SUROS looks like a kids toy or something buzz lightyear would use. All IMO of course - glad you were blessed by RNG :)