I meant the level of take down defense rather than those individuals themselves; poorly worded on my part.
Yes, Crocop and Daley will easily beat 98% of pure BJJ (or judoka or wrestlers) in MMA; there's a reason we know their names (ie they've won at high levels in MMA). What I should have said that given a striker of about the same level as the grappler (ie recreational vs recreational, competitive vs competitive, elite vs elite), how easy it is to take them down will depend upon the individual striker. Some are much easier to take down than others - some aren't going down unless you have good takedowns yourself.
Clinching and dragging someone down doesn't work as well as some people think - you need takedown skills yourself to be sure of it. Go to a wrestling or judo club, and ask if you can try it against someone who just wants to stay on their feet, you'll be surprised. Or alternatively, watch some MMA, and you'll see why even guys like Werdum, who has some takedown skills, couldn't get someone like Overheem down with clinch and drag.