Are our wingers poor defenders?

Are our wingers poor defenders or is it our own defensive system hanging them out to dry? 

Every match I go into it thinking that the opposition just has to figure a way out to suck our defenders in-field and then spread the ball wide quickly to run, unopposed, around our defensive line. 

Mapimpi and Dyantyi have saved our bacon quite a few times. 

Man for man, I'd say it's not the tackle but rather the defensive patterns not being done properly.

Our outside is rushing like an umbrella defence while the inside seems to slide in behind. I don't know why and I can't see any reason for it. 

Faf is also defending in the line a LOT, usually at guard(1st pillar) and not at point or sweeping.

Theres also not much in the way of trap/corridor defence or if they're doing it, it's not being done well.

Faf has done an incredible job there by the way. This isn't  a knock at him.

There is a problem in defending in the channel - both Pollard and Jantjies have fouled up badly in that respect.   This in the previous two tests were complicated by poor defense of our loosies.   I am not so worried about the center issue - bar perhaps the outside center,   In the last 4 tests De Allende took 41 tackles and missed only 5.   However, the same cannot be said about Esterhuizen and in the case where Pollard came on to replace a center - him also.  

I now that De Allende is out for the remaining two tests - but I think Esterhuizen will be seriously problematic in defense as he was in his last three tests and I would think that Erasmus realizes that using Pollard at 12 would be a poor option as well.   Willemse may even be better in that regard.   

However, I would really like to see how Willemse develops at flyhalf and dumping  him in a position where he has not played since the WC in 2017 would to my mind not help in his development as a player.      

Here we go again. Esterhuizen has yet to be surpassed by Damian. Both on attack or defence. 

No -please learn to read English:-

"Another factoring problem is our centers. Am has done well defending at 13 but at 12 and 10 it seems that there are vulnerabilities that cause our players to be sucked infield, leaving our wingers to cover a lot of space."