No I wouldn't. Strikeouts do nothing for the team. With Chris Davis on second and none out in a key situation on Friday night he struck out. A groundball to the right side would have been great in that situation... He certainly wasn't the top clutch hitter on the team this series. I think he stranded around 5 runners on Friday night over 3 of his at bats (all 3 were strikeouts).
I would definitely give Adam Jones the label of top clutch hitter on the team over Reynolds.
One series doesn't define an entire season. Like I said, he's got the best average with RISP and 2 outs and is top 4 with RISP on the season. I'd give the nod to Adam as well but it is worth noting that Reynolds has been "clutch" this year. The difference is when he struggles it is magnified and everyone wants him off the team but when he does come through with a game winning hit or when he does get the first RBI of a 7 run inning with a 2 out double nobody says a word about him. Even if he did ground out he would be grounding out to short or 3rd most likely which would have done nothing and a fly out wouldn't have done anything either.
The same thing goes with his defense at 1B. He has been great all series making scoop after scoop after scoop. He makes a bunch of diving plays as well all the time at 1B. Nobody ever says anything about that. But, when he makes an error you better believe there will be a thread made talking about how he shouldn't be allowed to have a glove, should be DFA'd, etc.
He's having a bad year but he's a career .800+ OPS hitter. It's not like he's 35+ like Vlad, Lee, etc. where the "track record" is nothing but hope. If he turns it on he can carry the team to the playoffs and if he doesn't he still is the best option they have at 1B.