Kamara is the only player other than Smith that had memorable game/season changing catches this year. But since Kamara is RB not sure why you even bring him up when the conversation was about WR's.
And Josh Smith was most memorable because very possibly he single handidly saved the season and Butch's job with that miraculous 4th and 10 TD catch to trigger comeback against Georgia (that play is also the most likely reason Miami and UGA both have their current HC's

).
Well, you said Smith was the only guy who had any catches last year...I simply pointed out all the players who had more, including a RB who had many more.
Next, no, Smith and Kamara aren't the only players who had memorable catches....at all.
First off, without Pearson's season saving 4th down catch on his back vs Georgia, Smith's catch never happens. Secondly, while Josh's catch was HUGE vs Georgia, it was only one of 2 catches he had that day, for 40 yds....the TD Catch for 39 yds, and one other catch for 1 yard. Malone was the best, most consistent WR we had that day....he had 5 catches for 60 yards, including a 23 yd catch that converted a 3rd and 10 on the scoring drive right before half that made it 24-17.
In the Alabama game, Josh Smith had 2 big catches (the 11 yd TD and the 27 yd catch on the first play of the 4th qtr scoring drive this gave us the lead. But Malone had 2 important catches as well....the 34 yd catch on the same drive that set up the go ahead score by Hurd, and a very difficult 9 yard catch that he had to fight for in double coverage to convert a first down during the last drive of the game.
I also remember some other big catches during the season....Malone's 75 yard TD catch vs Ky, Pearson's 37 yd td catch vs SCar, Malone's TD catch vs Oklahoma, PWill's 49 yd catch vs WCar and his back shoulder catch and run vs Georgia, some big catches by Wolf and Ellis, even a nice 18 yd first down catch by Johnson vs Bama.